"Unlimited" in terms of mobile internet originally meant you were not limited to certain web sites (eg just WAP sites) and is now seriously outdated.
BUT if Virgin are charging iff you go over 25Mb in one day that is far more restrictive than T-Mobile who's 1Gb limit on W'n'W Standard is a FUP that you will not be charged for if you go over. If you go over the limit with T 2 months on the trot they reserve the right to restrict your downloads and will suggerst you go up to one of their other plans (I'm on W'n'W Plus which has a 3Gb limit but also allows HSDPA which W'n'W Std doesn't)
T- Mobile have one of the fairest FUPs out. I also have a 3 data plan with a 5Gb limit but 3 just stop you downl;oading if you reach the limit in a month.
Voda charge people (sometimes a LOT of money) if you go over.
O2 aren't bad.
Orange don't have any data plans worth talking about.
Virgin's would be better if it was 750Mb in a month as most people would struggle to reach that on a phone - although most people will find 25Mb a day plenty it is possible to exceed that and to charge when people go over rather than just warn or restrict people could end up with some people getting nasty surprises.
Having said all that it is a step in the right direction and good news
