Info For Apple Support About WIFI and Upgrade IOS
 

I have Iphone 4s ios7.12 everything normal and WIFI OK.
When I upgrade to 8.1 my WIFI cant work...
When IOS 8.1.2 launch I upgrade again and my WIFI is normal again
When IOS 8.1.3 ready I upgrade again and my WIFI cant work again :confused:
And now IOS I upgrade to IOS 8.2 and my WIFI is normal again.....

How can it happened ??? It makes me nerveous when I want to upgrade IOS again... :rolleyes::confused:

And what? it's not iOS problem. It's all about wiFi module in your phone :)

maybe my phone is defective product........:confused: