PC Magazine's Bryan Gardiner takes a look at the current status of wireless VoIP, reporting from the wVoIP Executive Summit in San Francisco.

"What VoIP has done to the wired phone business, wireless VoIP is doing to the cellular business," says Dan Rosenbaum of FierceVoIP. "Just as the legacy phone industry has adjusted painfully to VoIP, the cellular industry is now having to adjust to wireless VoIP."

Still, BridgePort Networks senior vice president Sanjay Jhawar says dual-mode Wi-Fi/cellular services aren't exactly around the corner. "Nothing in this dual-mode handset market is going to come quickly," he says. "The first million subscribers on dual-mode handsets is still at least six to nine months away."

Even standalone wireless VoIP phones (without cellular capability) have significant limitations in terms of battery life and interoperability with different services. Ed Taulbee, director of carrier markets for Tropos Networks, says wireless VoIP providers "are still where cellular was maybe 10 years ago -- it's just going to take some time."