TS1398 I recently got a new screen for my iPhone 4s and now no wifi networks are showing up when I turn the wifi on.

I tried resetting my networks and turning my phone on and off with the wifi turned on, but neither of it worked. I don't know what to do and I really need wifi on my phone for tomorrow.

Did Apple install the new screen?  Or an Authorized Apple Service Provider?  If so, you should return to the location that replaced your screen to see if they didn't hook something up properly.
If it wasn't an Authorized Apple Service Provider, or an Apple Retail store, You should take it back to them and discuss it with them.  In this case, Apple will likely not offer any replacement service as it was opened by an unauthorized third party.

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