well you can plug in headphones/mic to the ipad or use bluetooth. while it doesn't fit in your pocket like a phone. nothing to stop it from working like one.
i've been a skype user for years (including skypeout). it's relatively cheap and it works. while it doesn't seem to have a wide audience in the US it is very much in use in other countries. quality is good enough for voice. on occasion i've had some overseas calls with echos, i just call back and it's gone. no worse than any other telecom equipment these days.
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