a communication terminal compatible with multiple smart cards includes a socket for inserting a standard smart card and a chassis for making the socket fitting at least one of small and ultra - small types of smart cards . the small smart card and the ultra small smart card insert into the socket through the chassis . the present communication terminal proposes a mobile terminal compatible with 3ff and / or 4ff card because of the arrangement of the correspondent chassis in the case that it only arranges 2ff card socket .