After a little digging over at GSM World I came up with a coverage map for Geocell which maintains, I am guessing, Georgia’s largest GSM network. Compare that map to the BBC’s map of South Ossetia below and it looks to me like it is Thuraya time.
It appears that there is almost no coverage to the northwest of Tskhinvali. Not exactly good news for organizations moving into the area to provide assistance. If anyone has info regarding this issue I’d like to post an update as soon as possible.