Tesco are offering 1,000 extra clubcard points on about 30 PAYG Tesco Mobile phones ranging in price from £40 to £100. Most of these also have at least £10 off them at the moment.
Free delivery, including Premium 2hr slots.
Also worth trying TDR-DHFD for £15 off £50 spend on Tesco Mobiles from another post on here, but don't hold out too much hope as it sounds as though it's account specific. Bargain if you can get it to work for you alongside this deal though!
Also a free spa treatment if you buy a Sony Ericsson phone over £50 - also included with this deal. See http://www.sonyericsson.com/pamperday/
If you buy, for example, the Nokia 2680 for £40.97, you get 1081 Clubcard points, which is worth £43.24 in deals, so you're getting a free phone plus a couple of quid. Delivered! But only good if you make use of the deals as deals, otherwise it's just a tenner's worth of points if you spend them instore.
And a quick search suggests you can get £30+ for the phone on Fleabay if you just want the points!