Causes and solutions of mobile phone disconnection

According to the information you provided, you can surf the Internet normally after changing the card, so it is not excluded that the mobile phone card you used before is damaged, which leads to unstable network when you use it.

radio interference

Strong interference of radio waves will lead to disconnection. Because mobile communication is spread by radio waves, when some radio waves interfere with the radio waves in use to a certain extent and the signal-to-noise ratio drops below the standard value, the mobile phone will automatically turn off and drop the line.

Architectural reflection

When the transmission is blocked and the building reflects, it will interfere with the radio waves at the receiving point and will also drop the line.

Handover failed.

When the handover fails, the user's voice channel needs to be switched from the original cell to the new service cell, but the user is also random when the new service cell is busy. If there is no effective voice channel to provide during the handover, the handover will fail, resulting in the disconnection of the mobile phone. If the call is suddenly dropped, you can move and change the location to avoid using it in a dead corner.

Consulting customer service

If you have any other questions, you can also consult the local manual customer service.