Q: does iOS 8.0.2 fix cellphone service problems?

my wife and I bought iPhone 6, and both of them were not working, specifically connection to cellular networks.

So, we had exchanged brand new iPhone 6, but new ones did not working, neither.

After exchanging, I figured out that those problems were not on iPhone 6 product, but iOS 8 bug.

I was waiting releases of iOS 8.0.2 to fix this issue, and finally updated it.

NOW, my wife's iPhone is working very well, but mine is not.

Even though there are full bubbles of cellular networks, my phone did drop calls.

Should I wait new iOS release or exchange new one again??

what about your iPhone on new iOS 8.0.2???