It's 90 days for everyone. There is no 800 number - you have to call 407-WDW-DINE. The people are extremely nice. Everytime I made a reservation, I ended up chatting to the person for at least 15 minutes. They had lots of good tips and suggestions, especially when the found out we had 6 kids under the age of 7 in the party.
Enjoy your trip!!!