This has been touched on before in other threads but not exactly the same. I use Google calendar every day. If I update on my PC it is on my phone almost instantaneously if I amend that appointment on my Hero it will not sync to the PC over 3G. (I amend, update on the move during my day out and about) The only way to sync is to return to the PC and connect my phone to home wifi and force a sync. (untick calendar in "Application sync settings" the re-tick) My Googlemail and contacts sync fine, 3G and wifi. Any ideas?