From http://www-support-downloads.sonymobile.com/k770/userguide_EN_K770.pdf it says :
Both the caller and the receiver of a video call NEED a subscription that supports the 3G (UMTS) service and you need to be within range of a 3G (UMTS) network. 3G (UMTS) service is available when appears on the screen....see Pg 20 of the PDF manual.
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