There are two types of SIMs. One can be handled by users, and the other must be handled by service personnel. For SIMs that can be handled by users, see the recovery procedures of the SIMs described in the applicable user guide to solve the problem. For the SIMs that must be handled by service personnel, contact the customer support. See SIM code list for troubleshooting by users or SIM code list for troubleshooting by service personnel for the SIM code lists.