It's the ultimate in blingtones - a 685,000 phone bought by a secretive billionaire Russian property dealer.

The GoldVish Plato is the world's most expensive mobile. The state-of-the-art Swiss phone was designed by top jeweller Emmanuel Gueit, who has created just 100 of the exclusive phones.

It is crafted from 140g of solid 18ct gold finished off with platinum. The buttons are fashioned from the finest-quality 100ct diamonds.