As of today Iphone 4S wifi wont turn on, stays gray. IOS 6.1.3

What to do if your iPhone will not turn on

OP says wifi won't turn on, not the phone.

Sorry, I didn't read carefully enough. My excuse is Monday morning, and I haven't had my 2nd cup of coffee yet.

This is the applicable link: http://support.apple.com/kb/TS1559

If this doesn't help post back, as there are more exotic things to try (although it could be a hardware failure in the radio chip, especially if it affects BlueTooth also).

Most likely it's a hardware failure if it's both WiFi and BlueTooth. There are some strange suggestions to try; if these don't work take it to an Apple store for exchange. If it's out of warranty it will cost $199.

• Turn off Cellular Data, reboot the phone. try to turn on WiFi.
• Put it in a ziplock bag with the air squeezed out, then in a freezer for 15 minutes (yes, this is not a joke).
• The opposite: Heat it with a hair dryer for a couple of minutes.

All of these have worked for someone, but not for most.

i am experiencing the same problem. I restored and updated my phone to the lastest ios update (6.1.3) then reset my network settings and it still did not work. I went on apple support and chatted online with a representative and they informed me that it must be a hardware issue meaning you would need a new phone. if you are under warrenty you can just make an appointment and/or mail in your old phone for a request of a new one free of charge.

If it's still under warranty forget the troubleshooting; just take it to an Apple store and get a replacement. Make an appointment first: http://concierge.apple.com/reservation/us/en/techsupport/

I had the same problem. I solved it by turning off airplane mode and rebooting.

I had this problem too. Maybe the update ruined the phone. I think we need a new update from apple.

Many users had this problem, but I think most encountered this wifi issue from updating ios. Im not convinced that this is a hardware problem yet. Im not gonna buy iphone 5 because of this.

Iphone 4s IOS 6.1.3

I have tried :

1. Verify that airplane mode is off by tapping Settings > Airplane Mode.
2. Reset the network settings by tapping Settings > General > Reset > Reset Network Settings.
   Note: This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings

It did not work.

THEN:

Turned on "celluler data and 3G" and fallowed again

Settings > General > Reset > ResetNetworkSettings

It worked 🙂 Wi-fi is enable on my IPhone 4S