Sony Ericsson W810i Black - Effectively you can get this mobile phone for £103.98
The actual price is £138.98 (with the 20% voucher), but you get £35 of free airtime bringing the effectual price down to £103.98. If you are on virgin mobile this is superb, if you're not, you can just sell the sim card and vouchers, and get around £30 for it which is still less than £110!
How to claim voucher:
Click [url=http://www.virginmobile.com/vm/lifestyleLanding.do]HERE[/url] or alternatively the deal button and then click the "Go Shopping" button at the bottom of the page. Make a note of the code (14000), and then when added the phone to the basket you add the code.
Also available at this price are: - Samsung E900 , Motorola K1 Krzr
Also there is 7% quidco available from any purchase at virgin mobile!