While I was out today with "Mobile network" selected and an HSDPA connection I was able to update weather, view a Google Map, browse web pages and read GMail messages. However, when I replied to messages in the GMail app my replies were not sent. They sat in the GMail app with the word "Sending..." shown in red in the Inbox. I tried toggling the mobile data connection off and on a couple of times, but still no joy. As soon as I returned home and reconnected through WiFi the messages were sent within a minute or so. Has anyone any suggestions as to what I might do differently next time?