im on o2 at the moment and am transferring to Orange (Because of the above mentioned phone and other things), now is it possible that they can move my number that i have now, along with all my contacts, and existing credit from the o2 sim card to my Orange Sim Card?

Hi Madgamer,
you should be able to get your entire sim backed up. Maplin do a small device or the carphone warehouse put it onto cd for you. As to the number you should speak to your new supplier, I don't see any reason why you can't take your number ( there might be a fee)

Do you get a phone that is not SIM-locked?
Cause then you would be able to insert your old card, and copy the contacts from SIM to phone memory.
Inserting your new SIM, and copy the contacts back to SIM.