I use Gmail when I’m on the move. I also have a 3G dongle from Three which is supposed to give me connectivity on the move. But for some reason, Gmail is unreachable via this connection. Twitter works (though slowly). In fact, everything is slow — see this ping testing the connection to Google.com.
Quentin uses a T-mobile USB modem and seems pleased with it. Maybe it’s time I tried another network. Or got a proper 3G phone that I could use as a modem.