Nokia Oyj unveiled a tablet running Google Inc.'s Android software, marking a return by the former smartphone-market leader into mobile devices just months after it sold its handset business to Microsoft Corp. The N1 tablet uses Nokia's software on top of the Google operating system, Sebastian Nystrom, head of products at Nokia, said at the Slush technology conference in Helsinki today. The device is made and sold by Foxconn Technology Group and costs $249 plus tax.