O2 are a sham of a company with no regard for their customers. I have been with them for the best part of 10 years with 10 Business SIMS. They have got worse and worse in the last few years. Dreadful, dreadful, dreadful reception everywhere I seem to go, including in the center of my local City. They rip you off with fake discounts that don't rise like their prices do every year. Then, even though you have 10 sims they offer a terrible out-of-Europe travel bolt-on in comparison to a retail customer who has one sim. I can honestly say that I have gone from an O2 fan to absolutely hating them. Cannot wait till my latest 3-year contract is up so I can go to a company with better reception and better service.