There are other VoIP providers out there that offer mobile service to customers with WiSIP (Wi-Fi Session Initiation Protocol) phones—BroadVoice comes to mind—but Montreal-based TéliPhone is the only one we know that led with a mobile service. Mobility is the company's raison d'jtre, though it does now offer Vonage-like wireline VoIP services as well.

"We wanted to focus on the mobility option," says CEO George Metrakos. "We had [developed] a much more advanced [back office] mobile platform, and went with mobile as a way to differentiate ourselves in the market."

TéliPhone, which moved into the U.S. late last year after first launching in Canada, is also interesting for the innovative business approaches it's taking to ensure Wi-Fi phone customers can actually use their phones when they're away from home or office—and to lay the groundwork for the coming era of dual-mode celluar/Wi-Fi phones.

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