The incoming call bell of iphone 4 doesn't ring, and the incoming call reminder and text message don't ring. Put on your headphones and you'll be back. Everything else is normal. What happened?

Check that there is a mute button on the left side of the front of the Apple phone, which can control the current ringtone. When you find that there is no prompt tone on your mobile phone, please check whether the mute function is turned on first. If there is still no sound when the phone is turned on, will it be better to restart the phone?

If it is not the function of the mute button, then you can try to restore all the settings of the phone. Open the Settings application on the phone's home screen.

Click to open the General option in the settings list, then find the Restore option at the bottom of the general list and click Open.

Click and select the "Restore all settings" option in the restore list, and then click the "Restore all settings" button to start the restore.

If it's still not good, it's a hardware problem, and it needs to be repaired, so it can only be tested and repaired after sale.