We went to Ireland last year and got a basic mobile phone with SIM card (and phone number) while there.
We will be going to England in less than a month and were going to bring the phone with us. BUT do we have to get a new SIM card (and phone number) when we arrive in London, or can we keep the same SIM card/phone number? Apologies for the ignorance - we just don't know if the numbers are usable in both Ireland and England.
If yes we do, I assume there will be a place in London Heathrow to purchase one?
Thank you again very much!