Bye Vodafone, Hello Lebara - time to switch from the Big 4
A Bit of History
Back in the day, there was a very small number of mobile phone providers you could use. Orange merged with T-Mobile to become EE. Vodafone has been around for a while. BT Cellnet demerged out of BT to become O2. Three was the newest addition, radically not offering the older 2G connections. (How quaint: 3G is about to be turned off.) So you had 4 choices.