Sim issue iPhone 8 Plus to iPhone 13 Pro
I recently upgraded between the 2 phones above via Vodafone. The Sim in the 8 Plus was fine. I received a new sim with my new handset, which turned out to be for another person. I rang Vodafone to query this and they said put you old sim in the 13 Pro. I did this and initially it worked then stopped - `No Service - so could not receive or make calks / texts.. Vodafone could not fix it remotely and sent me a new sim. This one does not work either, No Service in any location. .HOWEVER when I put my 8 Plus sim back in the 8 Plus Hey Presto - it works.
So what do you good people think is going on?
Best wishes
Andrew
iPhone 13 Pro, iOS 15