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.
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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 ★