Building for the iPhone 3G

[Gerry]

I'm using the wonderful service at testflightapp.com to distribute iOS builds to a few testers. One has an iPhone 3g, and when trying to register his device he gets the message "Give your developers some time to create a build for this iPhone 3g. Testflight will e-mail you when they have."

Can we not build for the 3g? Or is there a setting I'm missing?

Cheers

Gerry 
-- photo site: http://gerryorkin.com