You cant go back It was a setting change, cant recall exactly what it was, something to do with set up in Safari needs to be changed. Try this, go to Safari, clear cookies and clear history, then in the block Cookes, tab so its ticked on " from third parties and advertisers" See how you go, but yes it is a pain in the coit
It can be done as here is a local fellow in Esperance that's solved it.
He posted this on facebook..........Just wondering if anyone has lost their wifi on an Iphone 4S after an update? It's quite a well acknowledged issue. There is a fairly simple fix for this, touch wood. Pm me if you have the issue and I will tell you what to try.
Well jebus if you 2 have got it right -- glad for you 2 ---- yay, cheers for the advice.
Thanks to all above previous 2 post. No matter what I download and reset, still no wifi. Tried smashing flat onto a concrete slab that just made the screen turn blue for 10 or so seconds and sprung into life still fudged.