Ive always had my bold on 3G only well at least since two days after buying it.
I noticed i never ever dropped the 3G signal so i figured i didn't need the 2G & 3G option.
Didn't know it made a difference because lets face it i hadn't been using the device for long enough.
Great post Nicky as always!
ps: maybe that would explain why ive had such great battery life since i had my device ...