can I use my gps charger for my cell phone?

I have a Garmin Nuvi. Can I use it’s Automobile (lighter plug-in) charger for my Motorola Razor?
My house plug-in charger is rated at 5 volts & 550 milliamps. The GPS automotive plug has no rating – I assume it’s 12 volts.

It’s not a huge deal, I just want to avoid multiple plugs in the vehicle but don’t want to blow the cell buzz circuits with too much voltage.

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