Now that Skype will soon be able to allow VOIP from the mobile network (vs. currently being restricted to wifi only), wondering how much data usage a call may take. Not a concern in the US, but thinking more of overseas travel. If I was in the UK in roaming mode, where data is $19.95/mb and I made a 10 minute phone call using Skype, any idea how much data usage that would take? With regular rates at $1.29/min from the UK to US, interested in the cost comparison.