I tried to put a new sim in and it says I need a wep code, how do I get this (BB Curve)?

can you please tell me the wep coad

Is the BlackBerry Curve unlocked to the carrier who's SIM you want to use?

I think you meant to say MEP code, and that's because you are trying to use a different carrier's SIM than the one the phone is branded to. You will need to get the phone unlocked before it can take your current SIM card.