[cyclist]

I voted use 3G all the time, which is ever so slightly overstating my usage. I generally use 3G, but turn it off sometimes in order to use Navizon on the 2G network for places I've been before. Once my phone is on 2G I don't get round to turning 3G back on until I need to use data the next time. In my usual gym or swim/work/home day I'm either sat at a computer, have a wifi connection or am doing something other than using my device, so it can be 2-3 days till I go somewhere else and need 3G again.