iMessage glitches switched iphones

I recently switched to a newer(ha! iPhone 5) because older iPhone broke. I can’t select correct phone number for imessages. iMessage number defaults to previously used phone number of this phone.

Verification wheel goes round and round...nothing

To make matters worse, iMessages that should go to my wife’s iPhone 6 are defaulting to this phone that used to be hers, instead of going to her newer phone.

Now neither phone’s iMessage is working correctly. Can anyone help?

One phone at a time? In simple terms?

Thanks