Samsung mobile phone can't answer the phone, make phone calls, receive text messages or send text messages.

The following steps are recommended: 1. Search the network operator again. Operation: Settings-Connections-More Networks-Mobile Networks-Network Operators-Please select automatically. 2. Take out the SIM card and clean the metal contacts of the SIM card with rubber. (Is the sim card in poor contact? ) 3. Try to replace the sim card (Is the SIM card aging or damaged? ) 4. Check whether the mobile phone is equipped with software such as security guards or incoming calls, uninstall it and try again. 5. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings. If the problem still exists, it is recommended to send the mobile phone to the nearest Samsung service center for testing and maintenance.