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iPhone 4s, IOS 9.2.1, cannot get it to work.
I have an unlocked at&t iPhone 4s (I inserted T-mobile sim and it works, so the iPhone is unlocked) with IOS 9.2.1. I inserted the freedompop global sim and changed APN to freedompop.foggmobile.com, enabled data roaming; and still not working (no data, no internet). I am in US so the carrier it said is at&t. I rebooted it couple times and still no internet, no data... not working.