I've come across the fist issue for my phone (well, the cover really). Reception on Optus where I live is pretty poor (especially back end of the house where the rooms are). In my room I used to always get (on my old phone) reception. With the new phone, and with its cover on there's often no bars (i.e.: for a while tonight when I've been on the computer I've not been connected to the network). Without the cover one I get between 1 - 5 notches on this phone (I stay connected).
This is a bit of a problem. The cover that I'm using is the "clear front with leather back/sides and metallic belt clip type". Presumably the plastic / leather doesn't interfere with the reception... it's the belt clip???. I wonder where the antenna is physically located within the camera housing? Couldn't (easily) find a decent site that said this...
This is another reason why I will get a different cover - the belt clip annoys me and gets in the way; now it dampens the reception as well.
thanks to suzie. by "camera housing" I of course mean "phone housing"