In a bid to teach Ebay a thing or two about selling online, Carphone Warehouse has launched its new mobile-specific auction site, mymobileauction.com.Research commissioned by the ‘house, suggests that over a third of customers in Britain hang onto their old mobiles and are building up some sort of EU mobile mountain in their basements, garages and lofts. The idea behind the new site is to give the public a way of making some extra cash from their spent mobiles. BargainsTristia Clarke, Marketing Director for The Carphone Warehouse said: ‘Customers tend to change their phone every year so this offers the perfect opportunity to sell on old handsets. With new phone contracts often lasting 18 months, it also offers the chance pick up a bargain without having to wait for a free upgrade.’Mymobileauction.com’s USP is said to be ease of use, with a foolproof system of listing items and a simple, transparent sales system. It will cost you, however, although thankfully not very much. After the first month there will be a flat listing fee of £1.25, which includes a £1 fee for checking against a database of stolen mobile phones. Mymobileauction.com guarantee that stolen phones cannot be placed for sale on their site, since users need to register the handset’s unique IMEI number before listing it for auction. So round up that ancient Nokia and get it online. It has ‘retro-kudos’ now, don’t you know?