Changde Telecom 169 can handle 4 supplementary cards. Telecom stipulates that the name of an ID card can only have five numbers at most, and the supplementary card of telecom can only be consistent with the ID card of the main card, and there is no telecom number before. If the main card has only one telecom number, then in this case, four auxiliary card numbers can be handled. If there are other telecom numbers in the name, the number of supplementary cards that can be added will be reduced accordingly.