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  1.    #1  
    What are unlocked gsm phones and services...
    Bob Shipman
    Congressional District Foundation, PA One
  2. #2  
    The short version... a "locked" phone is programmed by your service provider to only accept SIM cards provided by that company. So if you are on T-Mobile and want to switch to AT&T, you're out of luck - the AT&T SIM card will not work in the T-Mobile phone.

    In an unlocked unit (as the Cingular T600's come), you can use anyone's SIM chip and the phone doesn't care. This is great for switching providers or for using a local prepaid SIM overseas.


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