Relevant part:
UPDATE: TechCrunch’s Zack Whittaker on Thursday posted the enhanced photo below of Khashoggi wearing an Apple Watch Series 3 in Istanbul last May. But according to Whittaker’s report, the third-generation Apple Watch does not support cellular connections in Turkey, effectively ruling out any chance that his data synced either with his iPhone outside or Apple’s servers.
I’m not so sure. I was in Istanbul recently and my Apple Watch (Series 3) was working fine. I don’t know if it was communicating via cell or Bluetooth, though.