P20 signal is not good, what should I do?

1. Please confirm whether your SIM card has passed the operator's real-name registration system authentication. If it is not real-name authentication, there may be problems such as abnormal signal, inability to talk, inability to send short messages, and inability to access the Internet for data services. It is recommended that you consult the operator's customer service for real-name registration system certification.

2. Please confirm whether to use protective sleeve, especially metal protective sleeve. Metal may interfere with the signal, resulting in the failure of mobile phone communication. It is recommended to take off the metal protective sleeve and try again.

3. Please confirm whether the SIM/UIM card has been cut. Cutting cards or non-standard SIM/UIM cards may lead to poor contact between card slots, no network, weak signal and other communication problems. Please change the standard SIM/UIM card in the business hall and try again.

4. Please confirm that the mobile phone is not in airplane mode. When airplane mode is turned on, the status bar will display the airplane mode icon, and there is no signal on the mobile phone.

5. Please restart your phone to try. If there is still no signal, please back up the data in advance and try to restore the factory settings to solve the problem, and restore or upgrade to the latest official system version. You can try to solve these problems by going to Settings > System > Reset > Restore Network Settings.

After the above attempts, it still cannot be solved. Please back up the information and bring the purchase invoice to Huawei Customer Service Center for inspection and maintenance.