Tube mobiles only in an emergency

I run the risk of being branded a Luddite, but the Tube has for me always been a sanctuary from mobiles - certainly in central London (Mobile phone services to be tested on Tube, 15 March).
But do we know the true cost of enabling this technology for the general public in the confines of the underground? It occurs to me that all these radio frequency signals are going to be absorbed by flesh and bone - and the reflected signals too.
Will London underground be insuring itself for the future in decades to come when millions of passengers - some no doubt considering themselves high net worth - for claims that manifest themselves in the same way that smoking, asbestosis and silicosis have?
By all means test and implement a system for use by railway staff, emergency services and contractors, which hopefully would have to handle far lower volumes.
Tony Wood by email