[asmosoinio]

Just google for it? I think this answers your question:

http://www.google.com/support/mobile/bin/answer.py?answer=39...

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Which phones does Google Maps support?

Google Maps works with the following devices:

    * Most Java-enabled (J2ME) mobile phones.
    * Palm devices with Palm OS 5 and above.
    * All color BlackBerry devices.
    * Windows Mobile devices with Windows Mobile 2003, 5.0 and above.
    * Symbian Series 60 3rd edition devices.

If your device is supported and you have a data plan, visit www.google.com/gmm from a mobile web browser to download Google Maps. If you're not sure if Google Maps will work on your device, visit www.google.com/gmm and we'll perform a quick check to see if your phone is supported.

Note: Google Maps doesn't work with BREW-enabled devices. Some mobile services providers may restrict data usage by applications. We recommend contacting your mobile provider to confirm the details of your data plan.

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[tocomment]

Right, I saw that but what exactly is a data plan, and what phone plans have it? I didn't see it on Verizon, Tmobile or ATT's sites. Maybe I'm just confused.