No wireless on 3GS after Jailbreak

[eleven7]

Up until today I have experienced no problems since jailbreaking my 3GS 2 days ago.

Today I went to go online and realised that I wasn't connected to the household wireless network which I've had no problems with up until now. I double checked the router which is all in order, which it was. Next I checked that I was able to connect to the router using 2 different laptops in the house, which I could. No matter what I do the iphone doesn't pick up any wireless networks at all even when I'm sitting right next to the router??

I tried inputing the network login details manually Settings>Wireless>Other
but I get a message saying the network can't be found.

In place where the wireless signal strength icon usually is on the menu bar, is a circle which I've never seen before but that might just be because I've always used 3G and since Im on holiday overseas, I have switched 3G off.

 

[ntrigue]

This is a known problem with OS 3.1.2 whether JB or Vanilla. Geohot explains on his blog.

 

[cscturulo]

You have to toggle on and off your network settings, reset them a few times and it should solve the issue.

 

[Moi un Mouton]

I had a similar problem. Reset network settings didn't work for me. This is what I did to fix it:

Put phone into DFU mode and restored to 3.1.2

Ran Blackra1n RC3, tested wifi OK

Ran Backra1n.app and installed Cydia, tested wifi OK

Installed OpenSSH and Terminal, tested wifi OK

Ran Blackra1n again and installed sn0w, tested wifi OK

Restored from backup, tested wifi OK

Tested the phone through a few reboot cycles, everything is now fine.


Because my initial install of 3.1.2 was an update, I assume that something already on the phone caused some kind of wifi firmware problem which was solved through the clean restore. Only other thing is that I normally have wifi switched off, so maybe installing with it off does something funny. That's all I can think of.

 

[eleven7]

Thanks for the replies. After reading the numerous related forums about the problem after a 3.1.x update, I used this tip to solve the problem...

1 - Turn on air plane mode.
2 - reset network settings.
3 - turn air plane mode off.
4 - connect to wifi.


Worked for me, but not everyone apparently. Hopefully Moi un Mouton tip can solve the problem for the people that the first fix doesn't work for.

This is pretty major and sounds like it has been around for a while, can't believe Apple hasn't fixed it by now.