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Is my s3 GSM?

So I bought in April and now considering "switching" to TM since it will be much cheaper each month. I can take my s3 over and just buy a sim card, correct?

thanks

Just out of curiosity how is T-Mobile going to be cheaper for you? Also yes blue is GSM white CDMA and shabby is right the GSM model came out if not the same day the same week as the S4
 
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