Why doesn't AT&T 4G work on the iPhone 5C?

I used to have an iPhone 4, and it would work perfectly fine on both the 3G and Edge network. Yet my new iPhone 5C will only work if it's on the LTE network. Right now it's on 4G, and it won't let me load any webpages at all. Also, it's giving me a lot of trouble sending texts. When I try to make calls, the voice cuts out and they get dropped. Has anyone else experienced this? Why did my iPhone 4 work well on 3G and 2G (Edge), yet the iPhone 5C can't even work on 4G? I'm considering switching back to my old phone if the problem doesn't get resolved or signing up with a different cell phone company.

LTE is 4G in case you didn't know.

As far as why the calls are dropping, you should check AT&T about that.

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