Telecom mobile phone card automatically hangs up after the call is connected.

There may be the following reasons, and the solutions are as follows:

1, restart the phone to see if there is a signal problem.

2. Set "Application Manager" as the slide screen option, find "Information" and click to clear the data.

3. Replace other SIM cards.

4. Check whether the mobile phone is equipped with security guards or third-party software, and test it after uninstalling.

5. Back up the mobile phone data and restore the factory settings.