The main reason to use your real info is that if something happens to that source, you can go and get your money back if they didn't pick it up. If you use fake info, you're out of luck. Also, if there's a problem on the form, you'll want to be able to change it. You call the number, and they want to call you back to verify it's you. They'll only call the number you put on the form. If you use a fake number, you're SOL.