There is no 800# for us 'normal' folks. There's a few for travel agents that get changed frequently once they get out to the public.
What are you trying to do?
For hotel reservations/general information/tickets 407-WDISNEY
For dining reservations 407-WDW-DINE
For tee-times 407-WDW-GOLF
If you're worried about the phone charges, get a $5 prepaid long distance card from your nearest Loblaws/Superstore/No Frills. At 4c/minute, you won't be worried about waiting on hold, and you can use the card in Florida too for the same price