Sometimes my iPhone will refuse to “see” any WiFi connections. I’ll go to SETTINGS and choose WiFI, but no wireless networks will ever appear. I know the WiFi is good in the area because my laptop sees and connects to them, but for some reason, the iPhone doesn’t want to be nice and go out to play.
There are some times on the iPhone when I can go to GENERAL, then SETTINGS, then RESET and then choose RESET NETWORK SETTINGS. After the iPhone reboots, sometimes the WiFi comes back. Sometimes.
But when that doesn’t work, there’s one trick that always does.
I power off my iPhone. Put it in a Ziploc bag. And put the bag on the top shelf in the freezer.
About an hour or two later, I take it out and let it sit at room temperature for about 20 minutes. Then power it on.
Every single time, the WiFi works afterwards. Not kidding!
I think it has something to do with the heat the iPhone generates. I have a 1st generation iPhone, and when I play games on it or do anything fairly CPU intensive, I notice it gets pretty warm. Usually, that’s right before the WiFi goes out. I have no idea how to fix this myself, but the freezer trick works great for now!