IPhone 4S will not connect to Wi-Fi

So I reseted all settings for my iphone because the camera icon was gone. The Wi-Fi was working totally fine before that but once it was done reseting, it won't let me connect to Wi-Fi. Even if I put I the wrong password all it says is "unable to connect to network". My brothers iphone is able to connect but not mine. And it is pissing me off much. I've tried almost everything to get It working

Did you restart your phone? Always works

Apple products have an tendency to not work with internet connections, if there are abnormalities in name or just changes in the internet settings, try reset the internetsettings.

If the other apple connects to the same wireless connection and yours doesn't and it is sure the apple issue (phone issue)
if your bro's phone is not apple, then it could be that your wi-fi is working on 2.4 ghz (40 mh) which apple does not support
call apple customer or read community forum in apple website