AT&T SIM - What info is stored on it?

Discussion in 'iPhone' started by DCIFRTHS, Apr 9, 2014.

  1. DCIFRTHS macrumors 6502a

    DCIFRTHS

    Joined:
    Jan 25, 2008
    #1
    1) What information is stored on the SIM card for an iPhone 5S?

    2) Is the information stored on the AT&T SIM the same for all makes and models of phones? For example a Samsung Galaxy, iPhone 4S or iPhone 5?

    Thanks!
     
  2. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #2
    Nothing from a modern phone is stored on the sim.
     
  3. DCIFRTHS thread starter macrumors 6502a

    DCIFRTHS

    Joined:
    Jan 25, 2008
    #3
    So it just an authentication device?
     
  4. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #4
    Of sorts yes
     
  5. parseckadet macrumors 6502a

    parseckadet

    Joined:
    Dec 13, 2010
    Location:
    Denver, CO
    #5
    The SIM does two main things:
    1: It provides information so your phone can identify itself to the cellular network. It does this with a unique ID.
    2: It instructs your phone which networks it is and is not allowed to connect to, and in what order (i.e. connect to the main provider whenever it's available, and only connect to a roaming partner if it's not). The only time the phone will attempt to override this is in the case of an emergency call.

    Optionally the user can store contact data on the SIM, but I don't know why anyone would choose to do so in this day and age. This functionality is a throwback to the dumb phone days. Every phone I ever had, going all the way back to the T-68i, always buried this so deep in the menu structure that most users never knew about it, even in the days that it would have been useful
     

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