1) Under the standby desktop-click Application-Settings-More Network-Mobile Network-Network Operator-Search Network-Select the network operator supported by your SIM card. 2) It is recommended to remove the SIM card, wipe the SIM chip with a rubber, and then insert the SIM card into the phone. 3) It is recommended to replace other SIM card attempts. 4) If you still exist, it is recommended to restore the machine to the factory settings and back up important data such as telephone books, videos, pictures, etc.). 5) It is recommended to upgrade the firmware upgrade.
1) Under the standby desktop-click Application-Settings-More Network-Mobile Network-Network Operator-Search Network-Select the network operator supported by your SIM card. 2) It is recommended to remove the SIM card, wipe the SIM chip with a rubber, and then insert the SIM card into the phone. 3) It is recommended to replace other SIM card attempts. 4) If you still exist, it is recommended to restore the machine to the factory settings and back up important data such as telephone books, videos, pictures, etc.). 5) It is recommended to upgrade the firmware upgrade.