Turn your cellphone into a free GPS.
Want directions but don't have GPS service?
Now mobile phone users in San Francisco, New York City and Los Angeles can dial DIRECTIONS (347-328-4667), say where you are and where you're going.
Dial Directions sends a text message with driving directions supplied through MapQuest.
The service is free but includes an ad at the end of the text message.

The next services I see is a link to the MapQuest map included in the text message.
Relevant ads (based on location) should be included in the direction text.