Sure. Availability is a different problem to computing power, but they&#x27;ll both be solved by network improvements. Underground metro systems will need cell towers (or just repeaters) in order to solve the lack of signal problem, but that&#x27;s relatively simple. I imagine it&#x27;s just a matter of cost and politics that stops them now. Alternatively, tube trains could have their own wifi that connects users to the internet.<p>Further into the future it&#x27;s possible (although unlikely in my opinion) that we could use a mesh network to relay signals along series of other people&#x27;s devices until it gets to a place where there&#x27;s a connection to a cell tower available. The power requirements would be a problem, and there&#x27;s the issue of data privacy, but it&#x27;s theoretically possible.