Why won't my iPhone 4S connect to iTunes?

I have an iTunes 4s and its about a year old. It used to connect to iTunes just fine.
I plug in my phone, and it begins charging, but still won't connect to iTunes or photo booth.
Its not my cords or laptop, because the cords and laptop work with my iPods, its just my phone. Ill answer any questions if more information is needed. But i really need my phone to sync! Thanks in advance!

Added (1). They are both connected to the internet, though i'm not sure how this would effect connecting to iTunes.

Added (2). Its been doing this for weeks, I have tried all common solutions

Maybe its not connected to the internet

Okay turn off your phone and close iTunes. Try again. Hope that works.

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