If you are going to make use of mobile data - web browsing, Google Mail Mobile, Google Maps Mobile, ShoZu, WidSets etc, you do need a mobile tariff that offers unlimited usage to avoid nasty bills! 3's X-Series tariffs are great. Definitely worth switching to 3 from another network. You also get a selection of pre-installed applications including Skype, eBay, Windows Live Messenger and others.
