BTK's advice is good...however, for an iPhone, I would drive to Orlando and visit the Apple Store. Make an appointment for the Genius Bar and they will take a look at your phone. If it can be repaired, they will give you a price. If not, they will most likely make you a good deal on a replacement phone. I had an iPhone go swimming and as BTK indicated, they replace mine for about $250, which is a lot better than $500+. They might even replace your 4S with a 5S or 5C.
The "rumor" is that Apple will announce the new iPhone on Sept. 9th. If this date can line up with your existing contract date and you can wait that long for the phone, you might want to keep that in mind. The newest iPhone 6 (if that's what it's eventually called) will be head and shoulders better than the 4S.
Lastly, you said it is giving you trouble. Tell us the trouble you are having and maybe someone here can help you fix it. There are lots of smart Apple folks listening...
Good Luck!
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