The scene on the big display in front of me looks like something from Grey's Anatomy. A team of doctors and nurses lean over a patient who's draped with a white cloth, while a TV screen beside the operating table displays a video of the patient's colon.

Suddenly, a yellow line appears on that video, showing the doctors where to cut. A voice comes over a loudspeaker, calmly talking to the surgeons. I'm at Mobile World Congress 2019 in Barcelona, and I'm watching what's been billed as the world's first live surgery that involves a doctor assisting from a remote location.