After updating to ios 6.0.2 on iphone 5 no signal?

Occasionally ill have one bar or 2 but most of the time it says no service any idea why?

IOS 6 is having lots of bugs. You better downgrade to previous iOS version or wait till an update come to resolve the signal issues

Try turning airplane mode on and then off it re-searches for signal. If not try soft reset.

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