I'm on a pay monthly idmobile sim and have been for years. I've just signed up for a 2 year deal through Carphone warehouse to get an iPhone15 with idmobile. I tried to use a PAC code to keep my current number but it said this couldn't be used as I was staying with the same network. They are sending me a new sim/new number.
How do I port over my old number to my new idmobile sim please? I've had this number 10+ years