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Phone Numbers
Go to any phone and enter the 18 numbers, in no specific order, to unlock Keeper of Secrets accomplishment. These can be found throughout the game on posters, graffiti, and pretty much anything else. Out of the 25, you only have to enter 18 to unlock the accomplishment, after that the rest are useless.
Password Effect
555-6118 1/18
555-1233 10/18
555-1037 11/18
555-3947 12/18
555-1206 13/18
555-9562 14/18
555-9528 15/18
555-7934 16/18
555-3285 17/18
555-7892 18/18
555-9723 2/18
555-1847 3/18
555-5289 4/18
555-6667 5/18
555-6205 6/18
555-4569 7/18
555-7658 8/18
555-9985 9/18