Question

 How to Use a Different AT&T SIM Card in an iPhone?

Answer When you purchase an iPhone from AT&T, the phone is "locked" to the carrier's network. That means it isn't possible to use the phone with another mobile service provider unless the device is "unloc... Read More »
http://www.ehow.com/how_8505233_use-att-sim-card-iphone.html

Top Q&A For: How to Use a Different AT&T SIM Card in an iPhone

How to fix my iphone.. I got an iphone from a friend with an optus sim card and I put a boost sim card in it then restored it via itunes to fix the camera now it says it needs the carrier sim?

Any time you restore an iPhone you will lose your jailbreak and your unlock and you will have to start from scratch and do it all over again. You also cannot use a Boost SIM card in an iPhone as Bo... Read More »
http://wiki.answers.com/Q/How_to_fix_my_iphone.._I_got_an_iphone_from_a_friend_with_an_...

Can you buy an iPhone and just put the sim card from your existing ATT 3G phone in I did so in my brother's iPhone and got service and wanted to know if there was a way to do this with a new iphone?

An AT&T 3G sim card will work in a new iPhone.yessss you can :) but the box for the iPhone comes with a little tool to help you open the little compartment for the sim card.... its hidden right und... Read More »
http://wiki.answers.com/Q/Can_you_buy_an_iPhone_and_just_put_the_sim_card_from_your_exi...

Do you need a sim card to use an iphone because I want to get a iphone 4 but i just dont want to use the phone on it. Will the iphone work without a sim card apart from the phone?

Can I take the SIM card out of my Iphone 3G and put it in a friend's older iPhone not a 3G and expect my basic phone services and mail to work?

Stick a paperclip into the little hole on the top, and the SIM card should pop out.
http://wiki.answers.com/Q/Can_I_take_the_SIM_card_out_of_my_Iphone_3G_and_put_it_in_a_f...


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