My girlfriend is very upset and doesn't like to talk. Sent a few short messages, but she didn't reply. A few hours later, she gave me a QQ reply. My cell phone was silent and I slept all afternoon.

1. The phone is mute. Go inside and turn up the volume. 2. Bad signal: With the popularization of 3G networks and the continuous improvement of signal quality of operators, there is basically no weak signal or poor signal in urban areas. But occasionally, because of many problems, there is no sound when the phone is connected. After the call is connected, the other party can't hear his own voice or can't hear his own voice, which is probably a signal problem. Facing it, look at the signal strength after hanging up. If it is weak, you can stay away from subway stations, underground parking lots and other places. If it is not very weak, you can redial. 3. Pause or prohibit the call: Some models have this function, which may be caused by touching the key by mistake. Then click the button again to see if you can hear the other person's voice. If not, you can try to redial. Different models have different setting methods. This possibility will be less. 4. Mobile phone damage: Generally, there are fewer such failures in mobile phones of large manufacturers, but there are more knockoffs with loud voices. At this time, if the mobile phone supports speaker playback, you can turn on the speaker or use headphones instead, but it is best to repair it during the warranty period before continuing to use it.