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I'm curious, what kind of data transfer rate do you need to get a solid call through? In the past when I tried to make WIFI calls through Google Voice "Hangout Dialer" the call quality was poor.

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For VOIP calls you don't need much bandwidth, but you do need low latency and low jitter. Both are pretty bad on cell-phone data connections, so it's rarely worth the bother.

However, these comments are about providing a wifi hotspot that routes over the data connection rather than VOIP.

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