Number transfer

Hello,

I transferred my old number from my old network to my new network to replace the new number, and the number switch happened earlier today. I’ve restarted my phone a few times and the new number has now disappeared from Settings and shows my old number, which is all good.

But it says that the number is not registered to my phone? It will be now since it’s transferred and I’ve had my friend call my old number and it comes through, any idea? Is it a glitch or something?