IPhone 4s WILL NOT connect to 4g Internet?

Ok for like 3 months my phone will not connect to 4g. It says it's connected, but it won't work. It's a HUGE pain in my but. I've tried EVERYTHING. Please help. This is getting so rediculas. I'm desperate.

Yes it will connect because it's only suport 3G service so you can't enjoy 4g service in your iPhone.

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