Customers of mobile companies use 4G services, and require the use of USIM cards to provide a higher level of security. The original SIM card is not supported by the 4G network, so customers must replace the USIM card to use the 4G service. SIM card, miniature

SIM card, NANO

SIM card is only reduced in size by card cutter, which is the change of the shape of SIM card. It is still a SIM card, which cannot be used in the 4G network, and the USIM card needs to be replaced; SIM card can also be slimmed down to MICRO\NANO when it is replaced by USIM card, which can be used with IPHONE.