The sim only deal that I've had for the past three years is fab. I normally get my parents phones when they upgrade, and since it's fairly often and I'm not bothered about having the latest iPhone a sim only package makes sense. I pay £15 per month and get loads of data, and more texts and minutes than I could ever need. Plus coverage is great. They also offer upgrades consistently and text you letting you know your payment is nearly due and when your monthly package renews. All round great deal. The only downside is that it doesn't work abroad however if I wanted I could add that on. Would also be good if perks where available but for £15 a month I can't complain.