How to install the silent lock on the security door Please describe the operation steps

1.The phone is on silent, go to the volume in the settings and look at 2Bad signal:

With the popularization of the 3G network and the continuous improvement of the signal quality of the operator, the signal is weak and the signal is poor in the urban area at present, but occasionally due to many problems, there is no sound when the phone is connected, and the other party cannot hear their own voice or they cannot hear the other party's voice after being connected, it is very likely that the signal is the problem. In the face of it, after hanging up, look at the signal strength, if it is weak, you can stay away from the subway station, underground parking lot and other places if it is not very weak. 3.

Pause or disable calls: Some models have this function, which may be caused by inadvertently touching the button, so click the button again to try to see if you can hear the sound of the other party, or if it doesn't work, you can try to redial. The setting method is different for different models.

This is less likely. 4.Handset damage:

There are fewer such failures in mobile phones from large manufacturers, and there are more copycats with loud sounds. At this time, if the 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 and then continue to use it.