If I understand correctly, my GT-19300T is capable of picking up not only 850MHz but also 900 and 2100MHz? It just seemlessly switches to whichever has the best signal? I read that vfone will be phasing out the 850MHz signal sometime soon. Where I'm coming from with these questions is that I live in Bellbowrie (17km from Brisbane CBD, not mountainous), was tired of constant call dropouts with vodafone so I switched to Amaysim (Optus) for a week and now I've been with Lycamobile (Telstra) for a week. My previous 1-2 bar coverage with vfone has gone to zero to 1 bar at best and can`t make or receive calls unless I go out into the street. Currently investigating whether to go back to vfone or get a 850mhz signal booster (which won't help the others in my family (vfone and optus). Any thoughts? Thanks in advance. p.s. hard to believe we're in 2014, 17km from CBD and can't make or receive calls on my mobile. I'm Australian but previously lived in Spain and had no such problems.