Already tried putting my mom's 4s on the fridge (the heck?). Also tried resetting network settings, updated to latest update but no luck. Wifi either grayed-out or unable to see available wifi networks. Anyone experiencing this?
If it's greyed out, I believe this could be a hardware problem. same issue? http://www.philmug.ph/forum/f126/iphone-repair-shop-do-we-have-here-38675/index64.html#post1304580
I solved the greyed out issue, the problem now is i don't see any wifi network available even i turn on/off the wifi toggle.
Have you tried reinstalling the update. usually after an update, I do a complete reinstall (erase contents) to refresh everything
I've only tried updating to the latest version but not completely restored everything. I'll try this later.
This worked for my friend and i did it personaly iphone 4s remove back covet the blower/heat technique possible too with back cover just the top part where the wifi is use hot blower for 2-3mins max
Update: Wifi went back. Did the "Hairdryer" technique. Still testing it though. I hope the solution will last.
Update: Wifi greyed out again last night. I've discharged my battery over night and charge it this morning. Wifi back to normal.
You can bring it to Burn and Jhoy for repair. Afaik, if you do not have it fixed immediately it will be permanently grayed out.