have the same signal issue also with my new Samsung Ativ S phone. My parents in Montana just behind the ridge, near Zambesi/N1 tollgate, they've always had bad signal, on all networks, they use voda and mtn, i tried Cell-C or Telkom, not really much better.... that area falls in a really bad 'blind spot' for cellular coverage. 3yr old Blackberry and dad's old monocrome Nokia still picks up a bar or 2 of signal, able to make & receive calls... but my new Samsung doesnt get a wiff of any signal of any of the networks. I see my daughter's new Nokia Lumia is also quite bad... every now and then able to at least pick up some signal, but still not what the old models are capable of.
So either the older phone's singal meter err on the optimistic side, or the newer models arent as good?
can it be the simcard? new phones with micro sim? I cant imagine it could be the simcard though? surely sim is just for authentication, etc?