Plot hole: Given the amount of destruction all over the world, it is HIGHLY unlikely the use of phones by general public would be possible, especially internationally. If any lines of communication were working, they would be completely jammed.

2012 (2009)
Ending / spoiler
Directed by: Roland Emmerich
Starring: Woody Harrelson, John Cusack, Danny Glover, Oliver Platt, Thandie Newton, Amanda Peet, Chiwetel Ejiofor
John Cusack's whole family survives with the exclusion of Scott. Lily no longer needs diapers, and the the arks set sail towards Africa.
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Jackson Curtis: When they tell you not to panic... That's when you run!
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Chosen answer: Its a safety device so the ship doesn't put to sea and ends up flooding the ship. The passenger ferry Herald of Free Enterprise capsized in the port of Zebrugge in 1987, precisely because the doors were not shut properly.
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