At home (which has crap coverage across all networks, 3g and non 3g), it shows from nothing to full. My old iphone shows full all the time at home but when making a call, it is quite clear that the signal is crap.

and:

I see problems with the reception gauge being all over the place, sometimes full, sometimes almost empty. Even without moving my phone. I’ve not had problems making or receiving calls though, so I just thought it was the gauge screwed