My iphone isn't working without Wi-Fi?

I have the iphone 5s and my carrier is AT&T. About 1 week and 1/2 ago I went out of the country for spring break and since I've come home my phone hasn't been working without Wi-Fi. Like when I'm driving somewhere or something and I don't have Wi-Fi the only thing that works is calling people. I've changed back all the settings. It's off airplane mode, all cellular data stuff is on. Someone help if you know how to fix this!

I have the same problem and so do most of the people I know with IPhones. I think that it is a problem with iPhones in general. My IPhone did this a few months back and I just waited it out and it went back to normal.

Go to the AT&T store and ask them to replace your sim card. This will make your signal stronger, doesn't void your warranty with Apple, and is free of charge.

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