Weak signal or no service now that I upgraded to iPhone 8

So I recently upgraded from an iPhone 6s to an iPhone 8 Plus. With my 6s I never had issues with getting good signal. But with my 8 I am having crappy cell service all the time. Even getting NoService sometimes. Can’t make calls and it takes forever to send pics sometimes.
Anyone else have this issue?
Community Power User
Community Power User

Try the following steps here. You can also enable Wi-Fi Calling here.

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Return it and wait for the iPhone 11's.  At least those will contain QualComm modems once again.  Intel modems are garbage!