You know those Vodafone signal booster things?

Thanks Sponge Bob.

When you say not cheap, how bad is it? My house is a disaster for phone reception thanks to stupid energy effeciency regulations. My phone is usually searching for a signal inside the house, but once I step outside, I've a full 3G signal.
All networks are the same. It's so bad, we had to get in a landline so we could get/make calls!

So as long as those boosters aren't ridiculous, they'd be worth it.