Why do i have to restart my iphone 4 to connect to cellular data network after moving out of wifi range?

Whenever I move out of a wifi zone, I expect my iphone to connect to cellular data automatically. But this doesn't happen. I have tried turning flight mode on/off and also tried turning cellular data on / off couple of times, but nothing works.
I only get the cellular data connection back after I restart my iphone.
I started having this problem after upgrading to iOS7.
Any idea how to fix this?

Hi beingkejo,
Thanks for visiting Apple Support Communities.
Toggling Airplane mode and cellular data are good troubleshooting steps. If your iPhone still does not connect to cellular data automatically when Wi-Fi disconnects, I recommend the additional steps in this article:
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
All the best,
Jeremy

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Why do i have to restart my iphone 4 to connect to cellular data network after moving out of wifi range?

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