Hi,
I'm just looking around for a new mobile phone deal and have stumbled across GiffGaff. It looks ideal price-wise but the cheapskate suspicious part of me thinks there must be a catch somewhere that I can't see. It seems too good to be true! 
Does anyone use it? Is it realy so cheap? And also, it suggests buying a cheap O2 phone (if you don't have an unlocked phone already) and just popping in the GiffGaff sim card. Does this actually work??
Many thanks!