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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.

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do you use the 3G network provider Internet/wifi as well –  Buscar웃 Jun 16 at 14:18
    
The phone should always have a 3G connection whether or not the WiFi is on or off or connected to a base station or not. Are you able to determine if 3G / data was working before WiFi drops or just assuming it's working up to that point? –  bmike Jun 16 at 14:26
    
@buscar Yeh it's the same wifi provider as it is 3G provider, but this happens even when I connect to wifi's that aren't the same provider –  man-qa Jun 16 at 14:38
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The OS is smart enough to only send very small notifications, but it does keep both connections alive. The majority of OS traffic and all app traffic goes over WiFi when that is connected and viable. –  bmike Jun 16 at 15:57
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It isn't a problem with his phone specifically it's a problem with all iphones. Mine does it too. People have been griping about this for ages. –  klepp0906 Aug 28 at 11:00

2 Answers 2

Is it Jailbroken? If not, I'd suggest going to see Apple Genius and see whether its anything hardware wise.

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Its not jailbroken, I think your probably right about it being hardware related as it is 2-3 years old. –  man-qa Jun 16 at 14:01
    
Its fine :) I'm sure they're figure it out –  DocAsh59 Jun 16 at 14:03

Try changing the cellular data network settings. This problem once happened to me; I was on O2 and once I changed the settings over to what the network provider told me to it worked. Also if you call your network provider they can change your settings remotely.

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