Iphone 4s 4G stopped working randomly?

I have an iPhone 4s from AT&T and It runs on 4G. A little while ago, the 4G just went away. I tried restarting my iphone, and I reset my network settings. Does anyone know how to fix this issue?

This happened to my iPhone 5 with 3G.
Firstly, go to settings, and turn on airplane mode for around 30 seconds. Turn it back off (obviously your Wi-Fi should be switched off too). All this does is re-connect to your network. This made my 3G work.
If this doesn't work, go to Safari, and clear your web history. It might be slowing your 4G down.

Easy. The iPhone 4S NEVER (! Underline) had 4G. If the AT&T guy said it had 4G, he's lying and should be fired.

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