Apple 6 mobile phone sends text messages without prompting (you don't know there is a text message until you turn on the vibration and ringtone). The notification settings are fine. Ask someone for he

Apple 6 mobile phone sends text messages without prompting (you don't know there is a text message until you turn on the vibration and ringtone). The notification settings are fine. Ask someone for help. 1) Under the standby desktop-click Application-Settings-More Networks-Mobile Networks-Network Operators-Search Networks-Select the network operators supported by your SIM card. 2) It is recommended to take out the SIM card, wipe the SIM chip with an eraser, and then re-insert the SIM card into the mobile phone. 3) It is recommended to replace other SIM cards as much as possible. 4) If it still exists, it is recommended to restore the machine to the factory settings and back up important data such as phone book, video and pictures in advance. 5) It is recommended to try firmware upgrade.