The N900iL, which went on sale in Japan, is a dual-network handset that supports a 3G FOMA cellular network and wireless local area networks based on Wi-Fi standards, the Tokyo-based telecom company said.
The phone is designed to act as a standard FOMA phone, while also capable of placing voice over Internet Protocol calls over a wireless network. Optional settings enable users to receive calls only over FOMA or a wireless LAN, or both.
Standard phone functions, such as call hold and call transfer, are available over Wi-Fi, as well as added features, such as instant messaging.
Albert Lin, analyst for American Technology Research in San Francisco, said the DoCoMo phone was the "world's first commercially available combo Wi-Fi/cell phone."
"We have been big proponents of Wi-Fi becoming a major standard, and the combo phone has been the largest market opportunity in our view," Lin said in a research note.
Adding Wi-Fi support to cellular phones provides access to Internet services that could come from carriers or corporate networks.