I must commend the NE line for spoiling me silly with its 3.5G network when I travel to work every morning.
However, when I take the EW-NS lines back home from work, my internet connection slows to a crawl (2.G anyone?) and I often need to reset my handheld in order to get it back.
As high-speed network coverage had not been made mandatory inside subway lines, it is unlikely to see a 3G symbol anytime soon.
Wonder whom I can write to feedback...