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Serious question...not trying to be snarky...

Why would anyone use anything but FoxFi?

EDIT: I suppose FoxFi doesn't work on some phones + using both radios at the same time might run down the battery quicker.

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From personal experience, USB tethering is both faster (bandwidth-wise) and uses considerably less battery than Wifi tethering.

The implementation of Access Point mode in some phones isn't great (especially in high noise environments), I've found that Bluetooth PAN mode tends to be more reliable, actually.

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