Fold it up and put it in your wallet...A UK inventor has designed a mobile phone so thin it can be stuck on a piece of paper, folded up and put into a pocket or even into your wallet. The phone, which is designed to be used once and thrown away is being targeted at the greetings card industry and has already scooped first prize in a competition run by tech giant Sony. Stephen Forshaw, the man behind the phone, believes it will work as an alternative kind of greeting card as it can be attached to a card and posted due to its lightweight, wafer-thin design. People receiving the phone, dubbed the PS Call Me, would follow instructions to dial a pre-programmed number which would either connect them to a messaging service wishing them, for example, a happy birthday, or it would dial the sender of the card who could offer their own personal greeting. It is thought the phones would retail for around £10.