Airvana is a company from Boston that makes femtocells - tiny mobile phone masts that are designed for homes that don't get particularly great mobile reception.

But the technology can be used for more than that. In a bizarre demonstration...

Vodafone recently launched its "Access Gateway" product, which is a plug-in box called a femtocell. This morning, Pocket-lint was invited to a demonstration of one in action from a company called Airvana that makes the devices.

But you might...