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wireless is a shared network bandwidth technology...it is akin to a wired hub...only 1 person can send/recieve at a time otherwise collisions occur. with any latency sensitive application (voice, video, on line gaming) the non-dedicated bandwidth will affect the overall response time. for your father, I would attack on the voice side: most of the IP telephony providers (vonage and the like) will perform fairly to very poorly on a wireless broadband connection.
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