My iPhone 5 doesn't switch back to 4G?

Well when I lose signal for a little while it goes to EDGE as it should, but when I get full signal back it doesn't go back to 4G. I have to turn it off and on to get it back. What would cause this?

That's because iPhones suck. Switch.

Apple would cause that

I have a similar problem. With my iPhone it is when I go out of total phone signal for some time, 10 - 20 minutes. When I get back into an area with a signal it sometimes does not recover.

Turning OFF / ON is the only way I found to sort the problem.

You could try resetting the iPhone. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.

When you reset you should not loose any of your data, however if you were entering data into an application this may be lost.

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