I'm at eComm in Amsterdam - and currently listening to a very interesting presentation from James Body (historically with Truphone but wearing a different hat today).
A few years ago, I wrote about the UK's low-power GSM auctions, and the subsequent slow-burn deployment of various GSM picocell-based services from companies like Teleware. It's never really lived up to its promise, though.
I hadn't realised this before, but apparently it is now legal to deploy low-power GSM in the guard band in the Netherlands, *licence-free*. I'm not sure exactly how this is implemented, as presumably there needs to be some sort of coordination to manage interference. Maybe you act as "your own MVNO"? One of the audience reported that the Dutch military was already using this option to build their own mini GSM networks on their bases and ships.
More interesting still - apparently this approach conceivably be rolled out Europe-wide. Worth watching....