The Lumia 520 from Nokia is a superb Windows Phone 8 handset. You're looking at a dual-core CPU setup, decent display, standard rear shooter and 8GB storage, it's essentially a entry-level Windows Phone but without the sluggish performance you may expect from such a low price point on competitor platforms. The Carphone Warehouse in the UK have the Lumia 520 on sale for just £59.95 on PAYG.
The Windows Phone is available on Vodafone, Virgin Mobile, Orange and T-Mobile, each requiring a £10 top-up. O2 is also on the list, but the charge is £69.95 for the handset alone. If you're looking for a great gift for someone this Christmas, the immensely popular Lumia 520 is a solid choice.
Source: Carphone Warehouse