So i decoded the game's "Contact index" item's code. Its basically the numbers equal the letter of the english alphabet. 

(12 5 1 22 5) "Leave" (20 8 5) "the"  (2 1 19 5) "base" (4 5 19 20 18 15 25) "destroy" (20 8 5) "the" (6 9 12 5 19) "files" (1 14 4) "and"

(5 22 1 3 21 1 20 5) "evacuate" (14 15 23) "now".

"Leave the base, destroy the files and evacuate now. "

Love details and codes like this in games like this.