Does anyone know the official definition of the 10kb minimum charge for GPRS mobilise plans on Vodafone? This question was posted a while back by someone. My experience is that the 10kb is not rounded up per 'session' but in fact rounded up every 20 minutes. One byte of data being sent every 20 minutes would therefore be billed at 30kB per hour. From my tests this time of 20minutes appeared to be changed from 1 hour earlier this year.