Great company for great deals. This was the 3rd or 4th purchase of a mobile or sim through mobiles. The site is really easy to use and breaks down the deals so you can see exactly what you are getting and for what price. All of the purchases over the last few years have envolved cashback. It is clear what bills you need to send and when, although you don't get reminders from Mobiles but this is easy to set up yourself in any calendar app. The bills I have submitted have never been rejected and the cheque arrives in the post a few days later. With the ability to pay in cheques with my mobile phone and baning app this is not much of a hassle, and is one I am happy to do as it means I have a great deal on a well known network. I have used the upgrade option on the site as well as a new contract and both have worked well and allowed me to port my nummber or keep my number with no issues. The most recent upgrade I did, just happened rather than needing to have another sim delivered, so this is good from a green perspective. Overall I am really happy with my contracts, price I pay and the service I have received from Mobiles over the last few years.