Hi,
Just to give an update on this.
I spoke to my network provider earlier and they said I could change to a pay as you go plan and keep my phone number but that I need to give them 30 days notice to change me from my
contract to pay as you go.
They said I have an option in my contract where I don’t need to pay an extra fee. Also they said I just top up £10 of credit as and when online or on the app, I don’t need a new SIM card and that I could dual SIM with a US phone number as well.
I just need to call or text every 6 months just to make sure I keep active on their network but it was a very helpful call.