(The capacity of the SIM card is 16KB, 32KB and 64KB. The larger the storage capacity, the more information can be stored. The common 16KB card can generally store 200 sets of phone numbers and their corresponding names and texts, and 40 sets of short messages. , 5 or more recently dialed numbers, SIM card password (PIN). Users who want to obtain some value-added services provided by the operator more conveniently can consider changing to the STK card, the original STK is an enhanced version of the SIM card.)