The SIM card ( Subscriber Identity Module) in cell phones provide the same function.

FORBES: Leveraging TPM

Their latest plan: make the thin, white subscriber identity module (SIM) card inside your phone smaller, Reuters reported Tuesday.

FORBES: Now Apple Wants To Make SIM Cards Smaller, Too

RIM''s SEM is the backend solution for carriers that can securely manage credentials on SIM (subscriber identity module) cards installed in all types of NFC-capable mobile devices.

ENGADGET: RIM's mobile payment solution gets thumbs up from Visa