Porting number to ID but to a new phone that uses a different sized sim card

I want to port my old number to ID from another network. My old number is on an old Nokia A300 which uses a full sized sim. I want to port my old number to my new ID account to use on a new Samsung J3 which uses a smaller sim (and has a different current number which was allocated when I bought the phone last week from Carphone Warehouse). How do I move my old number from my old provider (currently on an old phone and big sim), to a new provider (ID) and a new phone which uses a small sim? I cannot transfer the old sim from my Nokia to my new Samsung because it won't fit.