IOS 6.1.2 WIFI Issue with Iphone 4s

SInce I updated my phone to ios 6.1.2 my wifi gets dropped or the button itself gets greyed out. I dont know what to do. Shuld wait for ios 6.1.3 or what?
This is the first time i am facing such an issue.  Apple customer care is also not able to solve the issue? Why every now and then this happens with apple device ?
Does apple takes its users for granted by releasing its software without having proper checks?
However it is quite surprising to know that my Ipad 4th Generation is working fine with 6.1.2. software.
Please help if anyone knows the solution.

Go to settings, reset, reset network settings. As the other suggestion said.
If its greyed out here is a link below.
http://support.apple.com/kb/ts1559

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