I have just swapped my Nexus one for a desire z on Monday and I haven’t seen the 3g symbol show up yet. For the last 6 months I have been with 02 on there 30 day rolling contract (simplicity) and with my nexus it would only drop the 3g signal when I went to work. I have spoken to a couple of my friends who have the older desire and they both say the very rarely get the 3g symbol.