You're correct, a 2gb card won't suffice
I'd recommend at least a 16gb card. The Class of the card determines speed... here's a quick thread I found Best SDHC card upgrade? and Upgrade SD Card in DX?
I realize they're regarding the Droid X device but SD cards are the same across all the devices... as far as what to expect from each.
btw... Welcome to the Forums!
to the forum. Glad you joined us.
Now on to business. I would recommend either an 8GB or 16GB SD card. Depending on how much music and other media you plan on storing on your phone. A class 4 card will suffice just fine for basic needs as it is the same class that comes in the phone.
Just an FYI, for future reference please do not cross post the same questions across the board.
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welcome welcome welcome
Aloha from Hawaii...
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