Why won't the WiFi on my iphone 4s stay on?

Hi
This is the second week now that my WiFi hasn't worked on my phone. everybody else in the house can using their WiFi so there is nothing wrong with the internet. When I try to put my WiFi on it either says that it is searching or it say WiFi off. can anybody help me? I have also reset my phone to see if that would work but it didn't. Is my problem something I can sort or do I have to go to a shop to sort?
thank you in advance 

Reset Network, tap Settings App > General > Reset > Reset Network Settings. Relog into WiFi see if better. If still problem, Restore iPhone with iTunes on computer. See if better. If still problem, and there is Warranty or AppleCare make Genius reservation and take iPhone to Apple for resolution.

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