SIM cards for iphone 4 and 4S questions

Discussion in 'iPhone' started by achtungfemme, Dec 12, 2012.

  1. achtungfemme macrumors member

    Jun 11, 2010
    (1) Is it possible to just take the sim card out of an old iphone 4 and put it in an iphone 4S and use it? They are the same size correct?

    (2) Will At&t count that as an upgrade? Or will they not even really know about it?

    (3) Do iphone 3GS's and Iphone 4S's have different sized SIM cards? If you get a used iphone 4S can you take the sim out of a 3GS and put it in a 4S? Or do you need to contact AT&T for a new SIM card? And if you do that will they count that new sim card as an UPGRADE?

    Thanks for your help!!
  2. rmhop81 macrumors 68020


    Apr 4, 2005
    Dallas, TX
    1- yes they both use a micro sim
    2- no, upgrades only count when you buy a new device from them. they will know about it and it will show up on your account but it won't affect anything.
    3- 3GS has a regular size sim card, you can get a sim cutter that will cut it to fit a 4 or a 4s. Upgrade is only referring to buying equipment through them. You don't have to sign a new contract if you bring your own device.

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