Depending upon software version, you can disable the data services. Options | Mobile Network gives you the option to turn data on, off, or off while roaming. You might also use the profile manager to simply disable alerts for emails. I believe there's a built in profile for "phone only" that will only beep and/or vibrate if there's a phone call.
957 => 5820 => 7280 => 7290 (UL) => 8820 (UL) => 9000 (UL/DB) => 9800