What's wrong with the black screen of the landline phone?

The landline turns black on the mobile phone, and the reasons why you can't make a call are as follows:

1. There is an error inside the mobile phone, which may lead to a black screen and make it impossible to answer the phone. At this time, you can try to restart the phone, or restore the phone system to the factory settings to see if you can solve the problem.

2. The location signal of the mobile phone is not good, which may cause the phone to be disconnected. At this time, you can try to move to a place with good signal and redial.

3. After the landline is connected to the mobile phone, it is necessary to ensure the correctness of the landline settings. If there is a problem with the landline settings, it may not be possible to transfer the call to the mobile phone. At this time, you can check whether the landline settings are correct or try to change the landline.

4. In the process of transferring the landline to the mobile phone, there is a problem in the network, which may cause the mobile phone to fail to transfer normally. At this point, you can try to reconnect to the network or change the network environment.

When connecting a landline to a mobile phone, you need to install the corresponding landline switching equipment or use the mobile phone to access the gateway.