If you're after a cheap WinPhone on PAYG, this offer from O2 is a decent shout. If you're looking for an unlocked version you'll be paying £15 more at the moment. That said, if you have an O2 contract sim card you can put it in and request that the phone is unlocked for free. The offer makes the Lumia 535 a better proposition for those looking for a low-cost Windows Phone, but the lackluster reviews suggest you should expect a budget experience for that budget price. Thanks to rejector1 @ HUKD!