wifi not working - grayed out, you can not find even

[omer007]

Hi people.
I have an iPhone 3G in USA, with a break-4.2.1 and modem firmware 16:15:00
For some reason suddenly tab for the WIFI appears to me in gray and can not even go in and search for networks.
I already ® ReSTOR ® IOL, reset settings, nothing helped.
Does anyone have any idea what else could be?
Thank you