IPhone 4S- No Wi-Fi Networks appear to try to connect to?

No networks pop up in my settings. I've turned it on and off. I put it in the freezer which worked only for 2 weeks.i've been on Sprint 3G for 2 weeks now (which is really slow) and I can't afford to talk it to apple. I'm not on iOS7. It is jailbroken.

Trying backing it up and doing a factory reset, see whether that helps and then restore your iphone?