Might work in Europe and other parts of the world, where there is one standard, but in North America, there is a disparate set of standards. What might be doable there, would be a communications module, where you install a transciever module for your particular provider.

Off the shelf, already invented.

Buy a laptop, buy a cellular modem on a PC Card which works on your desired cellular company's network, and you've got it.

However, until cellular stops changing, building it into the laptop directly is foolish. Look at these ten 'standards' active in North America:

AMPS 850 MHz

CDMA 850 MHzCDMA 850 MHz 1xRTTCDMA 1900 MHzCDMA 1900 MHz 1xRTT

GSM 850 MHzGSM 850 MHz w/ EDGEGSM 1900 MHzGSM 1900 MHz w/ EDGE

iDEM 1900 MHz

TDMA 850 MHzTDMA 1900 MHz

OK, then add Europe:

GSM 900 MHzGSM 1800 MHz

And, we have not even gotten started on the different standards for true 3G, with these waiting in the wings:

UMTS 850, 900, 1800, 19001EV-DV 850, 900, 1800, 19001EV-DO 850, 900, 1800, 1900not to mention that OFDM thing Flarion is testing.