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It depends on the lookup technology in use -- if, for example, they're able to use the HLR ("Home location register") belonging to the relevant mobile networks, they could look to see where my phone is. As long as my phone is connected to a network in France (with data switched on or off), you'd be able to tell I was there. 

Roaming costs are still an issue for many customers, but for me it's reasonably cheap or free for most of Europe and America, so I would really like this technology to work! 

Excellent piece Brett. I'm still frustrated daily by the need for a signature for all sorts of nonsense. I'll try your arguments the next time I'm in front of the risk team!