My iphone 5 has no connection without Wi-Fi?

Ok so i've had my iphone 5 for a few months now and its great but recently when I try to connect to games requiring Wi-Fi, or instagram, or the internet, I simply can't do it without Wi-Fi. It's aggravating sitting with my friends playing on our iphones when we all have at&t yet i'm the only one that can't connect. I have to have a strong Wi-Fi signal to be able to connect, even with full bars and LTE. This is ridiculous and i've read online to restart the phone and have done that several times - the problem still persists. Any help? Please?

Call your cell provider.

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