You'll need your iPhone's IMEI number if you want to unlock it and use it on a different cellular provider.
HowToGeek on MSN
How to Check if Your iPhone Was Refurbished
Find your iPhone's model number in the Settings app. If it starts with an F, it was refurbished by Apple or a carrier.
When buying a new iPhone, whether directly from a retailer, secondhand, or through an online seller, it's smart to double-check its authenticity and condition. Not all iPhones labelled new are ...
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