Jack communicates with Vika via the HUD in the Bubbleship, and a small earbud that provides two-way audio.
He talks normally to Vika, who responds in kind. There is no visible confirmation of his connection to Vika, and no obvious way for him to send information back other than the sound of his voice.
As shown during the lightning strike sequence, Jack’s earbud is connected directly to the Bubbleship. All of his audio and telemetry requires the Bubbleship to connect with Vika’s control tower. When the Bubbleship’s power goes out, Jack’s communication is cut too.
Eye in the Sky
Vika has complete control over the communications in the Bubbleship. She is able to see Jack’s video, hear his audio, and send him mission updates whenever she so chooses. Jack only has control over his connection to Vika by going places where the direct comms can’t reach.
Given the post apocalyptic wasteland they inhabit and the strength of other systems Jack uses, Jack should always have a communication link back to Vika. Current infrastructure, like the Drones or the TET when it is overhead, should act as a repeater system for Jack’s earbud.
A handful of orbiting drones and a satellite radio phone attached to Jack’s belt could easily provide near 100% uptime in communications and give a backup to systems like the Bubbleship. Judging by Jack’s reaction during the lightning strike, power failures in the Bubbleship happen often enough for him to have a routine for them.
Jack should also have an easy way to pause or mute communications. When he is in a stressful situation, he may not want the distraction of audio. The audio might also leak from the earphone in quiet places, leaving him vulnerable to Scav ambush.
Any two-way communication system should have equal control for equal parties.
Ideally, comm failures should never happen in the first place. Modern aircraft are well shielded against lightning strikes, and do not fall from the sky (a Guardian post indicates that each commercial aircraft is hit, on average, once per year). The Bubbleship should be at least as well shielded as a modern commercial aircraft, and be able to maintain contact with its control tower during routine thunderstorms.
Advances in technology should not forget basic safety techniques from the generation of technology it is replacing.