Why doesn't my 4G work on my iPhone 4s?

I have AT&T and my 4G seems to not be working. I also have unlimited texting and calling. I don't know if it's my phone having problems or what. I've tried turning my phone on and off. I've went to Settings>General>Reset>Reset Network Settings, and that didn't work. I've turn Airplane mode on for 30 seconds and turned it off. I've also rebooted my phone. None of these things seem to work. I would like some help, please and thank you.

Added (1). I've had 4G for almost a year (or whenever 4G came out)

The iphone does not have 4g.

Because it's 3g phone so it will not support 4g

I think the iPhone 4s only has hspa plus not LTE

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