Nokia has just introduced the N810 Internet Tablet, its third stab at a Linux-run Wi-Fi tablet and the second since bringing these devices under the umbrella of its Nseries of consumer-orientated smartphones.
Unlike with its smartphones you can't make phone or data calls over a cellular network with Nokia's tablets, however. Rather, they're designed to access the Web (through its Mozilla browser with Flash support) and send and receive e-mail, for example, over Wi-Fi, as well as perform voice calls using VoIP (Voice over Internet Protocol)—with Skype support.
http://www.smartphonetoday.com/articles/2007/10/2007-10-18-Nokia-s-Third.html