Corrected entry: Upon receiving documents from Henry, the Records Keeper, inside the vault, agent Cooper turns and immediately makes a phone call while still inside the vault. Given the location of the vault as it is shown in the movie and the fact it is a vault, it is highly unlikely a signal would get through.
BocaDavie
21st Feb 2011
Red (2010)
Correction: They could have something installed that transmits the cellphone signals between the vault and the outside via cable. It's the CIA after all.
Correction: "Highly unlikely" is not a movie mistake. Since the movie depicts him making the call you would have to prove that the signal could not get out of the vault for it to be a mistake.
BocaDavie ★