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depending on your subscription (and country), they will charge you way more than $2 per minute in data traffic though.

Voice is bandwidth intensive.

I'm in Europe and bandwidth costs are relatively insignificant (as long as you don't travel abroad). Data roaming is whole different story, I really hope European Union will do something about it.

yesterday I did a bit of research. I reset my iphone's data counter and hold a 2 minute skype call over 3g with my girlfriend. We held a normal conversation with both of us talking.

After two minutes, I sent out 652 KB of data and received 798 KB.

So this means that a minute of data is around 750KB.

My mobile subscription (Swisscom) comes with 250MB of inclusive data for CHF 35/month (around $35 or EUR 25).

With 750KB per minute, I can in theory talk for around 5.5 hours if I do nothing but Skype. My current data usage is around 50 MB/month, which leaves 200 MB unused which then is good for 4 hours of talk time.

Not bad.

I would have thought that a Skype conversation uses way more bandwidth than it apparently does.

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