I'm doing some tests at the moment of the iPhone on XT and Vodafone.
I just put a Vodafone SIM card into my iPhone and the "Operator logo" says "Telecom NZ".
Huh?
I turn off the phone and turn it back on to see if it was some sort of error.
Still Telecom NZ!
So I check my Carrier settings, and it is on Automatic. I set this to vodafone NZ (the other option is Telecom NZ), and it STILL says Telecom NZ.
I dial an 0800 number - it connects.
What's going on??
I have another SIM that I use with this iPhone and the behaviour is definitely not this!!!