I really like London and do come here often, but as soon as I go down an escalator to take the tube, my cellular signal fades away and I feel like my hands are bound until I surface again at the other end of the trip.
That feeling is of course heightened by having good underground coverage in most other cities I usually travel to and I keep wondering why on earth London, capital of a nation that has fierce competition amongst network operators and good network coverage hasn't come around on this issue yet!?
Even in mobile markets that aren't known for their competitive environment such as France, the metro is fully covered, even between the underground stations. Worries about terrorists using the network for their purposes are in my opinion also no good reason for not going forward. Previous attacks unfortunately worked despite no cellular network being present to trigger anything.
Also, arguments that it's difficult to find space for cables also don't count as Transport of London has just finished deploying their underground Tetra network. Signaling equipment being sensitive to GSM or UMTS? Unlikely if TETRA (probably on 450 MHz) doesn't confuse the equipment…
And finally to those who argue that people using the phone create disturb others, take a Eurostar to Paris and convince yourself of the opposite. Most people in the metro use their phones for texting, emailing and web browsing as it's just too noisy for lengthy phone calls. So no worries here either.
So please, everyone involved, give yourself a push to finally do it and join the rest of the developed world!