The practice of keeping your phone off or in flight mode most of the day to save battery and only turning it on briefly every now and then to check your messages, missed calls, fantasy football points, the football scores etc.
Like a WW2 submarine; coming up periodically to check their position and take on fresh air before going deep to avoid detection.
Jim: "Does Clive know we're headed to the Anchor, I can't hold of him? "
Greg: "He's periscoping so best just message him on Whatsapp to meet us there"
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