Can I switch my AT&T SIM card from my iPhone 3GS to my new iPhone 4?

Sue August 22, 2012
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Can I switch my AT&T SIM card from my iPhone 3GS to my new iPhone 4 to continue use it or do I have to unlock the iPhone 4?

  1. Katie Conway
    October 8, 2012 at 9:08 pm

    Not really. The 3GS uses a standard size SIM card and the 4 takes a micro SIM

  2. April Eum
    August 27, 2012 at 5:21 am

    As long as your iPhone 4 is an ATT carrier brand..and you also have to realize iPhone 4's take micro sim card, not regular sized sim card from 3GS. you can buy a micro sim card punch from ebay as low as $5, it also doesn't matter if you have the 4G LTE sim card

  3. Jeff Hamilton
    August 23, 2012 at 1:50 am

    Provided it is an AT&T iPhone 4, you will have no problem at all.

  4. Dalsan
    August 22, 2012 at 6:44 am

    As long as the iPhone 4 is AT&T branded or an unlocked GSM model, your Sim card should work. If it is a CDMA phone (Verizon or Sprint), it won't work.