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While many consumers may be kicking landlines to the curb in favor of cell phones, most growing businesses are behaving more circumspectly. "We've found it's not so much a trend of [businesses] moving entirely away from the landline as it is shifting a lot of minutes over to wireless," says Matthew DelPercio, associate analyst with research organization The Yankee Group.

Looking past mobile phones, VoIP over Wi-Fi could help move the sluggish landline exodus along. Dual-mode handsets that seamlessly connect to Wi-Fi at the office and to cellular on the go are especially intriguing. But Yankee Group analyst Gary Chen sees challenges to the young technology in the forms of a lack of industry standards, reduced battery life and quality of service issues. Chen recommends that businesses invest in VoIP over Wi-Fi at this point only if there's a clear need for it, your network can handle the added traffic and you can live with its current shortcomings.