How to turn on the speakerphone to listen to the voice when making a phone call?

"The following actions are recommended:

1. During the call, adjust the volume up key.

2. Turn the machine on and off again.

3. On the standby screen, click Applications-Settings-More Networks-Mobile Networks-Network Mode-Select GSM Only.

4. Try different contacts, whether they are all the same, and rule out whether the other person has a problem with his mobile phone.

5. Test after replacing SIM card

6. Test after updating the mobile phone system version

7. Back up mobile phone data (phone book, SMS, multimedia materials, etc.). ) and try to restore the phone to the factory settings.

If the problem still exists, it is recommended to bring three-guarantee vouchers and send the mobile phone to the nearest service center for testing. "