Update to ISO 6.0.2 keep loosing signal, getting no service, we use two iphone 4 and 5 I update it and others its ok, pretty sure it's update couse losing network signal , what shall I do ?

Keep getting no service since update the iphone to ISO 6.0.2 .
We have two iphone 4 and 5, 5 update and no service and 4 it's ok, same network.
Apple could you help me with this please ?
I do a lot work with phone and now I have phone only works with wi fi and keep breaking on my network.
Thanks.

My wife's iPhone 5 is having the same issue. I also have an iPhone 5 with iOS 6.0.2 and mine works perfectly. Not sure what can be the issue.

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