How to know to what carrier my iphone 4s is locked to?

I bought an iphone 4s phone and would like to unlock for t mobile. But wen I try to unlock it on my computer its asking me what carrier it is and I don't know

There's sites where you can look up the phone's IMEI and find out. You could also take it to an Apple store

Unlocking phones in the US is illegal without permission of the carrier though.

There are actually many ways to know what carrier your iphone 4s is locked to. First is through websites. There are websites which allows you to enter your IMEI and you will get all the info you need to know about your iPhone 4s. Another way is via special apps - like iPic. You can download it to check the iPhone carrier. Or another way is through an iPhone App.iCarrier from AppStore lets you check IMEIs for network and lock/unlock status.

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