IPhone 4S won't activate with carrier?

I just updated to iOS 7.1 beta 2 (someone in the UK added me to their developer thing, I'm from the US), and now I can't activate with my carrier. Do I need to call my carrier or is it because the developer account is from the UK?

Just restore in iTunes and it should work fine. It's possible that UK version is different.US carrier uses CDMA and/or GSM

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