This is a really dumb question - apologies. I have an iPhone and a SIM only monthly contract. The contract is expensive and has a low data allowance. Changing the contract will be cheaper and better. When I fill in the online order it seems to suggest I need a new SIM. Is this so? Will I have to do anything to port my existing number? I’ve tried to online chat (a joke) and can’t get into my local store. Be very grateful for advice.
