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Old 03-31-2009, 10:48 AM   #11 (permalink)
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Correct me if my conversion math is off, it's been awhile:

Assuming 20 kbits/sec of data usage, you're looking at around 120 kbytes per minute each way. So 240 kbytes of data usage per minute when a call is being made.

Assuming a 1 hour call: ~14 mb

Online bandwith calculator says a 1 hour data call over GSM is about 15.56 mb.

Source: FaktorTel - VOIP Phone Company - Leading Australian VOIP Service Provider for Residential VOIP and Business VOIP

Not bad for an hour, but making copious amounts of VOIP calls could definitely push someone who was already a heavy user toward their data cap. I believe most "unlimited" plans cease to be "unlimited" when one hits 5 gig.
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