Is the iPhone 3g?

Yes, all currently sold iPhones can receive internet from AT&T's 3G wireless internet in America and other carriers' 3G internet in other countries.

If you have an iPhone 3g can you get picture text or is that only for iPhone 3gs?

Picture messaging is available on every model of the iPhone, including the 3G. However, this feature is only available if your iPhone software is running on version 3.0 or lat (MORE)