IPhone 4 AT&T not connecting?

My phone was working fine Saturday, Sunday, and even this morning, but after that, I no longer get 3G service, and even with 4 "dots" as they are with IOS 7, I can't send a text or call. I checked everything in settings to be sure no one switched them off. The only thing off is Data Roaming. I don't have it jailbroke or anything, so I have no idea what's wrong.

1Try Taking away all metal away from the room area
2Go to AT&T
3Use a hotspot and connect to your own Wi-Fi
4Go to Apple Support
5Go outside
6Softly drop your phone on carpet
7Try messing around with your settings
8Turn 3g and Wi-Fi on and off
9Make sure a lot of people are not on the Wi-Fi
And 10Make sure you paid your bill and have an established connection

Downgrade.

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