Kirdog: I have noticed that signal strength with vodafone is a -78dBm (9.5 Mbps data speed) and with telecom is -98dBM(1.04 Mbps data speed) at the same phone location, cell towers located at the same position (vodafone and telecom), but signal strength difference is huge.
Something wrong here, is it "green" cell tower with reduced power usage? :D
PM me some details - Location, MSISDN, times, and signal strengths - and I will take a look. It looks like from all your posts your not on the ideal serving cell and may only be connecting to our WCDMA2100Mhz network.