iPhone not connecting to 3G after losing wifi connection Everytime I am connected to wifi, then lose the connection (e.g. by leaving the house), the 3G on my iphone 4s refuses to work. I have to turn my phone off and on in order to get 3G again, and then I lose the 3G again next time I connect to the wifi.

I can work around the problem so theres no point getting my phone repaired or doing anything drastic, I just wanted to know if any of you knew what is causing this and if there is an easy way to fix it.
Is it Jailbroken?
If not, I'd suggest going to see Apple Genius and see whether its anything hardware wise.