Hello
The Sprint/Verizon iPhone 4S does have a GSM side to the device that is used for International Roaming only.
The GSM side of the device is locked by the service provider to block it from using domestic GSM networks (such as AT&T or T-Mobile). Locked, at the firmware level and can't be unlocked. Almost all of Sprint's and Verizon phones are locked in this manner to prevent you from using them on other networks.
In my experience I have not seen anyone successful with either Verizon or Sprint get the GSM part of their device unlocked and working properly on AT&T or T-mobile. It couldn't hurt to contact Verizon and see if they have ability to unlock an iPhone 4S and the GSM side of the device, however it won't work. : / (Sorry.)
Keep in mind that the Verizon iPhone 5, 5C, 5S, 6 and 6+ are unlocked from the factory and will work without any additional unlocking steps. The Sprint 5, 5C, 5S, 6 and 6+ are all locked and need to be unlocked or flashed.
Hope this helps!
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I've The same problem but with i Phone 4 and I'm Egyptian citizen. What can I do?
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I 've iphone 4s model 1387 working In GSM ...can I use it for cdma Sim ....and how? ??
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