How nice that would be to call on the go and get direction as a text message?
Dial Directions offers this free service currently in New York, Los Angeles and the San Francisco Bay Area.
Step 1: Call DIR-ECT-IONS (347-328-4667)
Step 2: Say, Where you are and the place where you are going.
Step 3: Receive the driving directions by text message.
Dial Directions says it is compatible with any cell phone.