We stuck the phone on there becuase the kids love playing with it. Allison frequently "calls Grandma and Grandpa." Its very cute... and the phone is more useful as a pretend toy for the kids than a connumication device when you don't have land-line service.
Anyway, the plans we used for the kitchen can be found here. There are several other plans on that page too. This kitchen is patterned after a now-discontinued Pottery Barn Kids play kitchen.