On Tue, 18 Dec 2012 10:49:38 -0000, "mark"
If you mean a private femtocell, I have a Vodafone one (Sure Signal)
and it works fine.
They can be, er, difficult to get working, not least because it can
take hours (and hours) for them to communicate with Vodafone Central
and configure themselves. This means that, every time you alter
anything around your local environment, you pretty much have to wait a
day to see if the change has had any effect.
You need the unit that's supplied by your service provider, and you
also need to register each handset so that they stay private (it's you
that's paying to buy/power the device).
FWIW I got mine at no charge, but that's because of carefully targeted
whingeing. Current units cost, I think, a hundred quid.