T-Mobile used to have a great customer service team and it beat the stuffing out of the Indian call centre that Orange used. T-Mobile also offers a great deal on the BIS BlackBerry service at £3.33 a month if you pay for £20 for 6months up front. Then they merged to form EE and according to one employee they got rid of the good bits of T-Mobile (like the UK call centre) and Orange because they were looking to save as much money as possible.

I'm with Three because they are so cheap on PAYG (321 deal) especially if you don't make many calls or use much data, I top up at most £10 every two months. I had discussions with O2, Vodafone and EE and none of them were able to match Three and this combined with non expiring credit 4G at the same prices and feel at home made it a no brainer. All the other networks offered rubbish rates unless you bought an add on which only lasted 30days which was more than I would be/was paying on Three.