Just tear it off. It is the network access license for your mobile phone. Its main function is that if the mobile phone is broken during the warranty period, it will be used during repairs. The label at the back can be removed, but it must be kept well. After all, it is very convenient to save. You can also wear a mobile phone case to cover it. Due to national regulations, telecommunications equipment must obtain a network access license issued by the Ministry of Information Industry. Without a network access license, it is not allowed to be connected to the public telecommunications network for use or sold domestically