How to Reset a Oppo K11x Phone That Is Locked | Dr.fone

How to Reset a Oppo K11x Phone That Is Locked | Dr.fone

Ian Lv13

How to Reset a Oppo K11x Phone That Is Locked

“Looking for the best solutions on how to factory reset Oppo K11x phone when locked?”

The need to reset a Oppo K11x phone arises in several situations like forgetting the password, PIN, or pattern, purchasing a second-hand device that is locked, accidentally changing the password or setting a wrong one, and others. In all these and other similar situations, you would need to reset your Oppo K11x phone and this can be done using different methods and tools.

In this article, we will discuss all these methods that can help you reset your device so that it can be accessed without any hassles.

Part 1: Things You Should Be Aware of Before Resetting Oppo K11x Phones

Before you start resetting your Oppo K11x device through any of the methods, there are certain important things that should be considered and taken care of. Check them out as below.

  • First of all, ensure that your Oppo K11x phone is charged so that the battery does not go off in between and stop the ongoing process.
  • Ensure to clear the cache on your Oppo K11x phone.
  • If your Oppo K11x phone is not locked, make sure to take the backup of the Oppo K11x device to prevent accidental loss of data. If the Oppo K11x device is locked, ensure that from next time you keep taking the backup on regular basis.

Part 2: How to Reset Oppo K11x Phone When Locked?

Once you have fulfilled the above mention pre-requisites, next comes the process of device resetting. If your Oppo K11x phone is locked, there are different methods that can help you reset your device and the popular ones can be checked as below.

Method 1: Reset Oppo K11x using Google’s Android Device Manager

The Android Device Manager which is also known as Find My Phone is an excellent feature that is majorly used for locating the lost or the stolen phone. This feature also allows the users to unlock and reset their devices. The Android Device Manager can only function if you know the Google ID and password that was used for device initialization. The feature can be used to erase the Oppo K11x device data and reset it.

Steps to reset Oppo K11x phone using Google Android Device Manager

android device manager

  • Step 1. On your PC browser, using your Google account, sign in to the Google Find My Device.
  • Step 2. The list of devices will appear on the screen, from which you need to choose the Oppo K11x phone that you want to unlock and reset.
  • Step 3. Now, from the available options, click on ERASE DEVICE.
  • Step 4. Again, tap on ERASE DEVICE, and to continue you need to log in to your Google account.

With the completion of the above steps, your Oppo K11x phone will reset.

Method 2: Perform a Hard Reset on Oppo K11x with Hardware Keys

Hard reset which is also termed factory reset is a feature that will reset all the Oppo K11x device settings and bring them to the factory setting status. While you perform the hard reset, all the data of your phone as well as the installed apps will also be deleted.

Steps to hard reset Oppo K11x Phone

  • Step 1. Using the Power button, turn off your Oppo K11x phone.
  • Step 2. Press and hold the Volume Up and Power button together for a few seconds.
  • Step 3. In some time, the Recovery mode will load on the screen. From the menu, choose to Wipe data/factory reset using the Volume Up/Down buttons and the selected option can be confirmed using the Power button.
  • Step 4. At the space provided, enter the word Yes and then click on the Wipe data/factory reset button.
  • Step 5. Again, to confirm the hard reset, click on the Wipe data/factory reset button.
  • Step 6. The process of hard resetting will start and when completed, click on Reboot system now for restarting the unlocked phone.

hard reset with hardware keys

Note: After the hard reset, Google Account Verification, FRP screen will appear where you need to enter the correct Google account or PIN that was previously synced with the Oppo K11x device. If you know the Google credentials, it’s great, but in case you have forgotten then no need to worry as there are Oppo K11x FRP bypass tools available as well as Oppo K11x codes that can be used to bypass the FRP lock.

Method 3: An Efficient Alternative to Reset Locked Oppo K11x Phone

If the above-listed methods do not work for any reason, we recommend using Dr.Fone-Screen Unlock (Android) as the best alternative. This is a Windows and Mac-based tool that can help bypass and remove all types of screen locks including PIN, passcode, pattern, Face ID as well as a fingerprint. The software not only works with Oppo K11x but all other popular Android devices including Oppo K11x, LG, Oppo, and more.

Safe downloadsafe & secure

The screen locks can be removed without rooting, and the software is completely safe to use.

arrow

Dr.Fone - Screen Unlock (Android)

The Best Tool for factory reset Oppo K11x Phone When Locked

  • Work perfectly to reset your Oppo K11x without a password.
  • It’s the only solution available that works with both Windows and Mac to help you regain access to your device easily.
  • Everybody can handle it without any technical background.
  • Except for resetting, it also unlocks the locked Oppo K11x if you are using a PIN, fingerprint, or other screen locks.

4,464,992 people have downloaded it

Steps on how to factory reset Oppo K11x phone without password using Dr. Fone - Screen Unlock

  • Step 1. Download, install and launch the Dr.Fone software on your PC and from the main menu choose the Screen Unlock feature.
  • Step 2. Next, your Oppo K11x phone needs to be connected to the system using a USB cable, and then from the interface select Unlock Android Screen option.

connect device to remove android lock screen

  • Step 3. In the next step, select your Oppo K11x phone’s brand from the supported list in Dr.Fone to ensure it enters the correct specific mode.

select device model

  • Step 4. Dr.Fone will begin unlocking the Android screen once it enters the specific mode. Please wait for the unlock process to finish.

remove now

Part 3. How to Reset Oppo K11x Phone at Normal Cases?

In normal situations, the Oppo K11x phones can be reset using the settings menu or the Android Factory Reset code. Both these methods and their guide to getting the process done are listed below.

Method 1: Reset Oppo K11x phones through the Phone Settings menu

To unlock the screen and reset your Oppo K11x phone, the settings menu of the Oppo K11x device can be used. For this method, you do not need to make your device enter the recovery mode. The steps for the process are as follows.

  • Step 1. On your Oppo K11x phone, open the Settings app and look for the Backup and Reset option from the Personalization section.
  • Step 2. Next, select Factory Data Reset Option.
  • Step 3. Go through the on-screen details and then click on the Reset device button.

The steps above will reset your phone to the default factory settings.

Method 2: Reset Oppo K11x phones with factory reset code

There are Android Reset Codes for different brands of phones that can be used for resetting the Oppo K11x device. These secret codes can be different phones as well as OS versions. In general, the code used for resetting Oppo K11x phones is *#*#2846579#*#*.

Steps to reset Oppo K11x phone using secret reset code

  • Step 1. On your Oppo K11x phone, go to the dialer and type the code- *#*#2846579#*#*.
  • Step 2. From the menu, click on the Restore Factory option.
  • Step 3. Finally, to confirm the resetting of the Oppo K11x device, click on the OK button.

The above methods can also be tried if you get stuck in a situation on how to factory reset Oppo K11x tablets without password. Also, we recently covered a method of how to bypass the Google account on Oppo K11x after a factory reset, we have now had the opportunity to test this with many people with different models of Android and have found mixed results.

Conclusion

The above given are multiple options that can be used for resetting your Oppo K11x phone when you forget your device unlock password. Some of these solutions can be used for free and if they work, nothing like that. Dr.Fone – Screen Unlock (Android) is one of the best methods to reset your Oppo K11x device as it supports removing all types of screen locks in a hassle-free manner.

Safe downloadsafe & secure

https://techidaily.com

Different Methods for Resetting Oppo K11x Phones with Screen Locked and Not

The Oppo K11x has made its place in the smartphone industry at a fast pace. Oppo K11xis dealing with a broad spectrum of products from flagship phones to smartwatches and security cameras. No worries if you own a smartphone owned by the label and don’t know how to reset your Oppo K11xphone without a password.

In the following article, you can learn all about factory resetting Oppo K11xphones, including an apt checklist of things to do before wiping all the data from your device. Also, discover multiple easy methods to reset a Oppo K11xphone with or without a password.

Part 1: When Should You Reset Your Oppo K11x?

Performing a factory reset on your phone is a significant step as it wipes all existing data on your device and leaves you with a blank slate. Here are some plausible reasons why you might want to reset your Oppo K11xphone:

1. Performing a Full Wipe

Sometimes, erasing all data on your phone is an evident need. If you want to delete all apps on your phone or restore them to factory settings, a direct factory reset provides a simple solution for this.

2. Forgotten Passwords

Forgetting your phone’s password is a catastrophe, and everyone is prone to it. If you end up locking yourself out of your phone after too many attempted tries to unlock it, a hard factory reset is sometimes the only option left. You can learn how to factory reset your Oppo K11xphone when locked and end up with a clean slate without any password.

3. Selling or Replacing Phone

If you choose to sell your Oppo K11xphone and move on to a new one, you will need to wipe all data from your device. Deleting everything from your phone before changing it is essential to protect the integrity and privacy of your data. In such a situation, you can perform a factory reset, and your phone will be good as new.

4. Virus and Malware Attacks

If a virus or malware attacks your device, it can slow down your phone and put your data at risk. To ensure that no trace of malicious software is left on the Oppo K11x device, you will need to perform a factory reset on your Oppo K11xphone.

5. Slow Performance

Apps installed from third-party sources can often hog up the storage on your phone and result in slow system performance. If your phone is acting slower than usual, you can factory reset it to resolve the issue.

Part 2: What Should You Do Before Formatting Your Oppo K11x?

If any of the above-mentioned reasons check a box and you wish to format your Oppo K11xphone, it can be done in a few instants. However, keeping in mind the severity of the consequences, it is better to keep a few things in mind before proceeding with the process.

Performing a factory reset on your device cleans every last bit of data from it. This means that all the images, documents, contacts, cache files, app data, Google accounts, and other stuff will be permanently removed from your phone. Hence, before formatting your phone, it is advisable to make a complete and up-to-date backup of your data.

The Dr.Fone - Phone Backup tool for Android is a competent software that can help you make a complete backup of your data. With a single click, you can transfer all the data on your phone to your computer. You can also sync your Android data to popular cloud storage services such as Google Drive, Dropbox, etc.

drfone phone backup tool

Before formatting your device, you have to keep in consideration Google’s Factory Reset Protection (FRP) feature. This is a security feature in Android phones that prevents unauthorized use of devices. FRP makes sure that only the owner of the Google account signed into the Oppo K11x device can perform a factory reset on it. If you have forgotten your Google account password, reset it in advance so you can format your phone. Note that you have to wait for 72 hours after changing your Google account’s password before formatting a linked phone.

safe Downloadsafe & secure

Part 3: How to Factory Reset Oppo K11x

If you know the passcode to your device, the procedure to factory reset your device is easy as a breeze. The following methods indicate how to factory reset a Oppo K11xphone when it is not locked.

Method 1: Factory Reset Oppo K11x via Android Settings (Factory Reset)

The easiest way to perform a complete wipe on your phone is via your phone’s settings. Here are the steps for that:

Step 1: Go to the settings of your Oppo K11xphone and scroll down to find the “Factory Reset” option. Typically, this option is under the “About Phone” or “Additional Settings” menu.

choose factory reset option

https://techidaily.com

Step 2: Now click on “Erase all data” at the bottom of your Oppo K11xphone screen.

tap on erase all data

Step 3: You will be prompted to type your phone’s passcode to proceed. Afterward, you can create a backup of your phone’s data by clicking on the “Back up” option. If not, hit the “Factory Reset” button and click “Next.”

back up your device

Step 4: Wait for 10 seconds and click “OK” on the screen. Now, wait for the reset process to complete, and you are all done.

tap on ok to confirm

Method 2: Permanently Erase Everything with Dr.Fone - Data Eraser (100% Wipe Data)

Although the settings app provides an easy way to wipe your phone’s data, the feature has certain drawbacks. Luckily, Wondershare Dr.Fone - Data Eraser (Android) offers an easy alternative for resetting your phone using its Data Eraser tool.

Dr.Fone can permanently and completely wipe all data, including contacts, messages, images, app data, and more, from your phone in just a single click. The process is quick and easy and provides data security to users. The following steps indicate how to reset Oppo K11xphone using Dr.Fone - Data Eraser (Android) tool:

Step 1: Use Data Eraser Tool

Install and launch Dr.Fone on your computer, and select the “Data Eraser” tool from the program’s main interface.

choose data eraser

https://techidaily.com

Step 2: Enable USB Debugging

Now connect your Oppo K11xphone to your computer via a tethering cable and enable USB debugging on your Oppo K11xphone.

tap on start button

https://techidaily.com

Step 3: Start Erasing Oppo K11xDevice

After attaching your phone to the computer, click on “Start.” Now, type in the confirmation code present on the screen and tap on the “Erase Now” button to reset your Oppo K11xdevice.

click on erase now button

The Difference Between These Two Methods

The conventional method of wiping your phone using the Android settings suffers a significant drawback. Due to the lack of data encryption by Android, data from almost 40% of formatted devices can be quickly recovered using data recovery tools. Even after a full factory reset, deleted files are retrievable to some extent.

The benefit of using Dr.Fone as your data eraser tool is that it can permanently erase everything on your phone. The program overwrites the phone memory with random data, hence securing your privacy. Data formatted via Dr.Fone cannot be recovered in any case, so you have nothing to worry about.

safe Downloadsafe & secure

Part 4: How to Factory Reset Oppo K11x When Locked

If you got locked out of your Oppo K11xphone, the process to factory reset your phone can differ slightly. The following methods describe how to factory reset Oppo K11xphone when locked.

Method 1: Via the Recovery Mode

One of the go-to methods for factory resetting a locked Oppo K11xphone is via the recovery mode. You can follow the steps given below to boot your phone in recovery mode and perform a factory reset on your Oppo K11xphone without a password:

Step 1: Long press the Power button on your Oppo K11xphone to turn it off. Now press and hold the Power button and the Volume Up button at the same time.

Step 2: Once the Oppo K11xlogo appears on the screen and you feel a vibration, let go of the Power button but keep pressing the Volume Up button. Let go once you see the “Recovery Mode” screen on your phone.

access the recovery mode

Step 3: Use the volume keys to scroll down the screen and find the “Wipe Data” option, then hit the Power button to select it.

choose wipe data option

Step 4: Press the Power button again on the “Wipe All Data” option and do the same on the “Confirm” option. After the resetting process is complete, select the “Back to Main Menu” option and reboot your device.

confirm the wipe data process

Method 2: Via Find Device

Xiaomi offers a “Find Device” option, using which you can learn to factory reset your Oppo K11xphone without a password using your Oppo K11xaccount. Note that for this process to work, you will require an active internet connection and a signed-in Oppo K11xaccount on your phone. Then, you can perform the following steps to wipe data from your Oppo K11xphone:

Step 1: Launch the official website of Oppo K11x and sign in using your Oppo K11xaccount.

proceed with find device

Step 2: Click on the “Find Device” option and select your phone from the screen’s upper-right corner. Next, tap on “Erase Data” and confirm the process to erase all data from your device.

tap on erase data option

Method 3: Using ADB Fastboot Tools

The Xiaomi ADB Fastboot Tools is a helpful app that enables users to perform ADB commands quickly and easily. The app comes with a range of beneficial tools that can help you wipe all data from your phone. Following is a step-by-step guide on how to reset Oppo K11xphone when locked using the ADB Fastboot Tools:

Step 1: Hold down the Power button and the Volume Down button at the same time until you see the Fastboot splash screen.

enable fastboot on mi phone

Step 2: Use a USB cable to attach your Oppo K11xphone to your computer and launch the Xiaomi ADB Fastboot Tools application.

Step 3: The app will automatically detect and display the information regarding your Oppo K11xphone at the top-left corner of the screen.

Step 4: Under the “Wiper” section in the app, click on “Wipe cache and user data” to reset your locked Oppo K11xphone.

choose wipe cache and data option

Method 4: With Dr.Fone - Screen Unlock (Android)

If you are searching for a reliable way to reset your Oppo K11xphone without a password, Dr.Fone can come in handy. Using the Screen Unlock feature of the tool, you can easily remove the screen lock and then perform a complete wipe on your device. Here is how to factory reset a locked Oppo K11xphone using Dr.Fone - Screen Unlock (Android) :

Step 1: Proceed with Screen Unlock

Launch Dr.Fone’s Repair Toolkit on your computer. From the “Home” tab in the main interface, click on “Screen Unlock.” Now attach your phone to the computer using a USB cable and click on “Unlock Android Screen.”

opt for screen unlock

Step 2: Enable Oppo K11xDownload Mode

Dr.Fone will detect and display your device information on the screen. Now boot your phone into Download Mode using the instructions present on the screen and download the recovery package for your device.

enable the download mode

Step 3: Remove Oppo K11xScreen Completely

Once the download is complete, click “Remove Now” to access your phone without a passcode. Then, you can factory reset your Oppo K11xphone from the settings.

tap on remove now button

safe Downloadsafe & secure

Part 5: FAQs about Oppo K11x

  1. How can I hard reset my Oppo K11xphone without a PC?

A hard reset basically wipes out everything from your device, including media files, contacts, and app data. As the above-mentioned methods indicate, you can easily perform a hard reset (aka factory reset) on your device without a PC.

  1. What is the difference between a hard reset and a soft reset?

A soft reset means rebooting your device to fix minor issues. It is one of the easiest and quickest ways to refresh your device and improve performance speed. The process clears RAM data and can thus clear caches or other background processes interfering with your device’s operations.

A hard reset is a process of restoring a device to its original factory conditions. Executing a hard reset means removing all data from your device, leaving you with a clean slate. A hard reset is useful for fixing serious issues on your device, such as virus attacks.

  1. How can I restore my Redmi in recovery mode?

If your Redmi phone is stuck in recovery mode, you can try the following method to fix the issue:

Use the Volume Up and Down buttons to navigate your way through the recovery mode. Use the Power button to click on the “Reboot” option on the screen. This will make your device exit recovery mode and restart normally.

If this method does not work, you can wait for the battery to drain fully from your phone and reboot it normally.

Conclusion

Oppo K11xis a famous brand that serves a large number of consumers worldwide. If you are also a Oppo K11xuser, you now know how to factory reset your Oppo K11xphone without a password owing to the in-depth guide mentioned above. Using these easy methods, such as Dr.Fone for resetting your device, can help save you a great deal of trouble.

The Easiest Methods to Hard Reset Oppo K11x

You can use Oppo K11x A37 hard reset to solve your various smartphone problems. If your Oppo K11x runs slower and its screen gets stuck, a hard reset can clear these problems. A hard reset also helps when you want to erase all data from your device before you sell. Suppose your phone runs out of storage. You can save your data on cloud storage and do a factory reset to free up space. You can also use it to unlock your device by removing the screen lock.

When you do a factory reset from settings, you will need the Oppo K11x device’s password. Dr.Fone is the best tool to hard reset your Oppo K11x without a password. It has an easy-to-use UI, and safe data backup features to enable users to back up their data before resetting. Here is the complete guide to hard reset your Oppo K11x using three methods.

Part 1: In What Cases Should I Hard Reset My Oppo K11x?

1: Can’t Unlock it (forgot password, too many wrong attempts)

Most people hard reset Oppo K11x because they forgot the lock screen password. When you can’t remember your phone’s password, a hard reset is the fastest way to unlock your device. With a hard reset, you can delete all types of data and settings from your device. It helps you remove passwords, PINs, patterns, and fingerprint locks. Once you forget your phone’s password and enter the wrong password too many times, you will get a blocking alert. After another wrong attempt, the system will block your device. When you reach this point, you can only use a hard reset to unlock your device.

2: Oppo K11x Works too Slowly

If your Oppo K11x works slowly, such as taking time when you open any app, you can use a hard reset to fix this problem. When you are using a smartphone, you can easily find out if it’s working slower or not. If your device takes time to load games or shows lag when you watch videos, you can do a hard reset to clear its storage. When you reset Oppo K11x, you clear its storage and cache, which helps your device work faster. It also removes junk files from your device.

3: Constant Crashes

Suppose your phone constantly crashes for no reason at all. Chances are that there is some problem with its software or new updates. When your device crashes, the screen gets stuck for some seconds before it automatically recovers. If it happens once in a while, then it is not a big problem. But, if it happens constantly, then you will need to fix your device before it gets even worse. An Oppo K11x hard reset reverts it to its factory settings by deleting all data, personalization, settings, and updates. Doing so removes any type of threat and bug from your device.

Part 2: What to do to Hard Reset Oppo K11x? 3 Easiest Ways for You

1: Hard Reset from Settings (password/pattern Needed)

The fastest way to hard reset Oppo K11x is to use the factory reset option from settings. Although you don’t need a third-party tool for this method, it requires the Oppo K11x device’s password or pattern. You can’t use this method on a locked Oppo K11x device. Suppose your phone has some issues like slow working, frozen screen, app crashes, or keeps rebooting. In these situations, the Oppo K11x hard reset is the best solution. Before factory resetting your device, create a data backup to recover it afterward. Here are the steps to hard reset Oppo K11x from settings.

oppo a37 settings menu

https://techidaily.com
  • Power on your Oppo K11x and open “Settings.”
  • Select “General Management” and tap on the “Backup and Reset” option.
  • Now, select the “Factory Data Reset” option from the backup and reset menu.
  • Tap on the “Reset Device/Reset Phone” option.
  • Next, select the “Erase Everything” option and enter your phone’s password.
  • Your device will automatically reboot after the factory reset is complete.

2: Enter Recovery Mode

You can hard reset Oppo K11x by entering the recovery mode if you forgot your phone’s password. You can use this method in case your device is locked, and you can’t reach the settings menu to do a simple factory reset. It also helps if your phone is stuck at the boot logo and keeps rebooting. You will lose all your data with a hard reset from recovery mode. Only do a hard reset if you know your Google account and password. Because after the reset is complete, the system will ask you to unlock FRP. Here are the steps to hard reset your Oppo K11x with recovery mode.

power and volume down keys

  • Power off your Oppo K11x with the power key, and make sure that you have at least 50% battery backup.
  • Next, hold the volume down + power keys at the same time till the Oppo K11x logo appears on the screen.
  • Release both keys when you see the Oppo K11x logo. After that, press the volume up key to enter the recovery mode.
  • Scroll down to the “Wipe Data/ Factory Reset” option in the recovery menu using the volume keys. Select it by pressing the power key.
  • Confirm your choice by selecting the “Yes” and “Delete all Data” options.
  • After the process ends, select “Reboot System Now” and wait for your smartphone to restart.

3: Dr.Fone - Data Eraser (only for deleting data)

If you want to permanently wipe all data and settings from your Oppo K11x, you can use Dr.Fone - Data Eraser. When your device is running out of storage or working slower, you can erase all of its data to fix these problems. Before you erase data from your device, you can use Dr.Fone to create a data backup with contacts, files, images, and your other personal data. This way, after erasing everything, you can easily recover anything you want. Dr.Fone is the best third-party tool with efficient solutions for any smartphone problem. You can use Dr.Fone to unlock devices, transfer WhatsApp, system repair, virtual location, and Data Backup & Reset. Follow these steps to hard reset Oppo K11x with Dr.Fone - Data Eraser.

style arrow up

Dr.Fone - Data Eraser (Android)

Hard Reset Oppo A37 Without Any Hassle!

  • Simple, click-through process.
  • Wipe your Android completely and permanently.
  • Erase photos, contacts, messages, call logs, and all private data.
  • Supports all Android devices available in the market.

3,762,641 people have downloaded it

  • Download and install Wondershare Dr.Fone on your PC. Launch the application and click on the “Data Eraser” tab on the main screen.

drfone home screen

  • Enable USB debugging on your mobile phone and connect it to your PC via a USB cable.

connect your Oppo K11x

  • After the connection is complete, Dr.Fone will recognize your smartphone and open the “Erase All Data” screen. Click on the “Start” option to continue.

start erasing all data

https://techidaily.com
  • Next, type the code that appears on the screen for confirmation. After you enter the code, Dr.Fone will start erasing data from your device.

erase data confirmation

  • Once the process ends, Dr.Fone will ask you to tap on the “Factory Reset” option on your smartphone. It will erase all settings and complete the factory reset.

data erased

https://techidaily.com

safe Downloadsafe & secure

Conclusion

Let’s end our guide for the easiest ways to hard reset Oppo K11x. You can do a factory reset if you know your phone’s password. If you don’t know the password, you can do a hard reset from recovery mode. The safest and fastest way to erase all data from your device is by using Dr.Fone - Data Eraser. With Dr.Fone, you don’t have to follow complex steps, and you can back up your data so you can recover it after the reset is complete. Aside from that, you can use Dr.Fone to unlock your device without a password.


  • Title: How to Reset a Oppo K11x Phone That Is Locked | Dr.fone
  • Author: Ian
  • Created at : 2024-09-19 16:02:35
  • Updated at : 2024-09-24 16:17:22
  • Link: https://techidaily.com/how-to-reset-a-oppo-k11x-phone-that-is-locked-drfone-by-drfone-reset-android-reset-android/
  • License: This work is licensed under CC BY-NC-SA 4.0.
On this page
How to Reset a Oppo K11x Phone That Is Locked | Dr.fone