I have been with o2 since 1998 and as my handset was playing up I wanted to do an early upgrade. I'm a big fan of HTC phones and wanted the latest 10 version the HTC range. I was shocked to find the o2 themselves were not doing the latest version and if I wanted anything close to that phone I would have to have the Samsung s7. I look to see if I could get my old tariff and I couldn't but found the closest to mine and it was £15 more.... I still had to contribute to the phone too, so I looked to see if I could get a better offer somewhere else and I found E2save. To my surprise they did the HTC 10 and I could get it on o2 as well, I saved £11 compared to o2 direct and I got the phone to for just £10 advanced fee....... I can only say check them out as I will be using E2save again.