A brief history of mobile phones:

It has been more than 35 years since Martin Cooper placed the first call on a mobile phone to his rival at Bell Labs while working at Motorola. Heck, it's been nearly 20 years since Saved by the Bell’s Zack Morris placed a phone call to Kelly Kapowski from his locker. In that time, phones have come a long way.
We now live in a golden age of mobile phones. Or, perhaps more accurately, the end of the age of mobile phones. The iPhone, the G2, the N95, the Bold: These are exceptionally small mobile computers with built-in telephony features.

Phone has become a function on a portable device.