The iPhone was first introduced and launched by Apple in January 2007. Since then, four generations of iPhone have launched from Apple. The most recent iPhone is the iPhone 4, which has two cameras for FaceTime video calling and a higher-resolution display.
This generation was released on June 24, 2010. As of 2010, the only cell phone provider that offers iPhone service is AT&T. Users have successfully unlock iPhones for T-Mobile users due to the fact that both carriers use the same SIM.
Users who wish to unlock an iPhone will be required to go through a series of steps involving entering specific codes and uninstalling and reinstalling iTunes. There have been rumors of iPhone becoming available for other carriers, such as Verizon Wireless and/or Sprint, but each year the rumors are dispelled by Apple and AT&T.
Only AT&T in the United States. The phone works on the GSM network, so it can be used for Tmobile, but the iphone 4 uses an micro sim, and not a standard sim card/chip, making it difficult to use on any other network other than AT&T.
Check out for unlocked iPhones here - iPhone-Unlocked.com.
Try mobile-unlocker.com/apple/rs2wp8/ which gives you a list of networks which offer Iphones.
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