FaceTime

FaceTime was a utility on an iPhone that allowed the interaction of one person to another through a screen.

FaceTime was used by Clara Oswald to speak to the Twelfth Doctor while Clara was on the Drum in 2119 and the Doctor was in the TARDIS in 1980. (TV: Before the Flood)

While recharging the TARDIS, the Thirteenth Doctor used Facetime to contact Graham O'Brien, Ryan Sinclair, and Yasmin Khan. (PROSE: Press Play)