Will the sim card of a 3GS work on a 3G (and vice versa)?

Discussion in 'iPhone' started by astr0nerd, Oct 6, 2009.

  1. astr0nerd macrumors newbie

    Sep 17, 2009
    I have a 3G and my mom recently got herself a 3GS. But she only uses it to make phone calls so she offered to exchange her with mine. The only way to do this is if I can switch out the sim cards.

    So is the sim card of a 3GS compatible with a 3G?

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