HT202645: Find out which SIM card your iPhone or iPad uses
Learn about Find out which SIM card your iPhone or iPad uses
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Helpful answers
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Jan 18, 2016 4:03 AM in response to hassan mansourby Rudegar,does it say invalid sim or does it not have a sim tray
if the former you need to contact the carrier it's sim locked to and ask your options
if it does not have a sim tray then it's not a gsm phone but a cdma phone and can't be used as gsm networks