Software defined radios--software that emulates all the functions of one or more radio transceivers--have been talked about for at least a decade, and at least one company--Vanu--has had its SDR approved for U.S. use by the Federal Communications Commission. The attractions are many: mobile communications becomes an application any device can be given; dedicated firmware and hardware are unnecessary; multiple radios can be made available to any single device; smaller radios are possible.An SDR could mean a global mobile device, able to work in Japan, on GSM or CDMA networks, with Wi-Fi or other wireless networks. Some users would love it. Mobile carriers have to be ambivalent. Sure, you'd like to sell a true "global phone." But then you also lose control of the end user and the device. Any truly global phone necessarily works with any mobile provider's network, as well as with Wi-Fi and potentially other wireless platforms--such as WiMAX--as well.
On the other hand, looking at this from a consumer device manufacturer's point of view, SDR is a wonderful thing. If you sell mass market communicating devices all over the world, and have to deal with disparate radio infrastructures and protocols, you want SDR because it streamlines the entire manufacturing and logistics process.
You build one device, supporting multiple radio types; not multiple devices designed to work on one sort of radio platform. If you are Apple, in other words, SDR is a really nice thing. It's a nice thing if you are Nokia as well. Nokia just has more entangling relationships with customers that undoubtedly will press Nokia not to make SDR available.
Also, no particular business model inevitably is bound up with the use of SDR, though obviously the technology lends itself to more open and flexible end user models. One can envision open, unlocked business rules on one hand and walled garden rules on the other where "roaming" is possible anywhere in the world so long as the user has agreed to pay for that privilege.
The point is that by fits and starts, we see more openness at both the device and application layers of any communications-enabled business, corresponding to the openness IP itself has brought to transmission.
