Hello, if there is no sound on the receiver during the call, I suggest:

1. Turn the volume button on the side of the phone to the maximum when talking.

2. If the machine supports turning off all sound functions, operation: Settings-(Device)-Auxiliary Functions-(Monitor)-Turn off all sounds-Uncheck.

3. Shut down and restart.

4. Check whether there is a film on the phone. If so, it is recommended to remove the test.

5. Try to change places. If the problem still exists, please bring shopping invoices, maintenance cards and goods. Have you updated your system recently? The new version may have cancelled the screen lock tone. You can go to the phone settings-sound-screen lock prompt to see if it is turned off.

If you have any other questions, you can enter the OPPO enterprise platform to ask the customer service! The machine is sent to Samsung service center, and professional after-sales engineers help to test it.

2. The mobile phone screen is locked. How to restore factory settings?

If you forget the phone's screen lock mode, you can clear the gesture unlock password and restore the factory settings as follows:

1. In the power-off state, press and hold the power-on key and volume reduction key for a long time to enter the recovery mode, that is, the recovery mode.

2. Press the Volume Down key, move the cursor to restore mdeo, and then press the Volume Plus key to confirm (Volume-Yes to select the volume+Yes to confirm).

3. After the small robot appears, use the volume down key to select Erase Data/Restore Factory Settings, and press the volume plus key to confirm.

On the next page, there will be many white English letters scrolling up until they are finished;

4. Then use the volume keys to select the erase cache partition, as described above.

5. After completion, you will return to the first page, and choose to restart the system immediately, and the phone will automatically restart, so that the phone will restore the factory settings and unlock the password by clearing the gesture.

3. I forgot how to lock the phone screen password. Turn on the button to increase the volume.

First of all, the computer downloads a one-click software, which has one-click unlocking function and supports some models.

2. 1: The mobile phone is turned off and resumed. Please refer to the corresponding brand and model for the specific access method (press the volume up button+power button to enter the recovery later).

2: Use the volume button to select Erase Data/Restore Factory Settings to clear all data, then select Yes-Delete all user data Yes-Clear all data and press OK (power button or menu).

3: Return to the recovery main interface, then select Erase Cache Partition to clear cache data, then select Yes-Delete all user data Yes-Clear all caches, and press OK.

4: Return to the main interface, select Restore, and then press OK.

5: All user information and data will be deleted after formatting. Please pay attention to backup.

4. How to adjust the screen lock sound of 4.OPPO mobile phone?

The screen lock sound of mobile phone can only be turned on or off, and cannot be replaced (Settings-Sound-Screen lock prompt sound);

Note: ColorOS 3.0 system can turn on the settings-sound and vibration-screen lock prompt tone, and choose to turn it on or off as needed.

The volume of the mobile phone automatically decreases. Please refer to the following methods for troubleshooting:

1. When the power of the mobile phone is low due to the power saving mode, the playback volume can be automatically lowered to avoid rapid power consumption, and the power saving mode can be turned off.

2. If conditions permit, it is recommended to replace the headphones for comparison;

3. The mobile phone software version is out of order, so it is recommended to update to the latest official version or refresh the system;

It can't solve the problem that the volume of mobile phones often automatically decreases. Please back up your mobile phone information (phone number, SMS, etc.). ) and send it to the local customer service center together with your mobile phone invoice and warranty card to help you check and handle it.

How to change the settings of screen lock mode:

For 1, ColorOS 3.0 and above, you can set other screen locking methods by setting-fingerprint and password (screen locking and password)-screen locking password-change password-screen locking password-other encryption methods;

2. For other ColorOS versions, go to Settings-General-Security and Privacy-Screen Lock, and then select the desired screen lock mode.

5. How to restore the click of Apple's mobile phone lock screen?

Settings, sound, lock tone

1: setting, looking for sounds

2: Just turn on the lock screen tone.

6. How to get rid of the sound by locking the screen and unlocking the phone?

First, take out the mobile phone battery and wait for more than three seconds before replacing it. When you press "Volume Up" and "Power Button" at the same time for more than 10 seconds, the phone will automatically enter recovery mode.

In recovery mode, use the volume up and down keys to select "Erase data/restore factory settings", and then press "Power button" to confirm the operation.

Then the window will pop up, select Yes, delete all user dates with the volume up and down, and press the power button to confirm.

After the cleaning operation is completed, use the up and down volume to select the item "Restart the system immediately" and press the "Power button" to confirm. Then the phone will automatically restart and enter the desktop. The screen lock password was successfully cracked.

7. Forgot the screen lock password, turn down the volume, and reset the phone with the power button. How to unlock the screen lock password?

If you forget the screen lock password of Samsung mobile phone, please refer to the following:

1. If the pattern/signature unlocking mode is set, you can use the PIN code set when drawing the unlocking pattern/signature to unlock it. Operation:

1). Enter the incorrect unlocking pattern five times, and the prompt message "Please try again in 30 seconds" will be displayed on the screen, and click "OK". Click "Backup PIN" in the lower right corner of the screen, enter the previously set PIN password, and click OK.

2). If it is a signature unlocking method, after entering the wrong signature for five times, a prompt for entering the PIN code will appear on the screen. Enter the previously set PIN, and then click OK.

Tip: The PIN code prompted when unlocking is the backup password set when you set the pattern lock.

If it doesn't work, you forget to back up your PIN code or you don't meet the above requirements, please send the machine to Samsung Service Center, and the after-sales engineer will help you unlock it safely.