A B727 ON LAST FLT BEFORE RETIREMENT; FLC UNFAMILIAR WITH OP BROADCAST ON UNICOM FREQ WITH NO RESPONSE AND LANDED UNEVENTFULLY NOT REALIZING THAT GYR IS A CTLED ARPT.

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WE WERE DELIVERING A B727 TO GYR FOR MAINT PRIOR TO RETIRING THE ACFT TO THE DESERT. LUKE AFB APCH CTL CLRED US FOR A VISUAL APCH TO RWY 3 AT GYR. THEY TOLD US TO CONTACT THE TWR; BUT GAVE US NO FREQ. NO COMMERCIAL CHARTS WERE AVAILABLE FOR GYR AND WE WERE USING UNFAMILIAR AIRFIELD DIAGRAMS. THIS MADE FINDING THE CORRECT TWR FREQ CHALLENGING IN A SHORT TIME PERIOD. I WAS FLYING AND THE FO FOUND THE UNICOM FREQ FOR GYR. I REMARKED THAT I THOUGHT THEY HAD A TWR FREQ AND HE REMARKED 'NO; UNICOM ON 122.95.' I ALSO HURRIEDLY LOOKED AT MY CHART; WHILE ON A SHORT R BASE; AND ALSO SAW UNICOM PROMINENTLY DISPLAYED NEAR THE TOP OF THE DIAGRAM. WE CONTINUED TO SELF-ANNOUNCE ON UNICOM AND WHEN ON SHORT FINAL I THOUGHT I SAW A GREEN LIGHT FROM TWR AND LANDED. ON ROLLOUT; WE DISCOVERED THAT TWR FREQ WAS 120.1; NOT UNICOM. CONTRIBUTING FACTORS WERE NOT BEING PREPARED FOR A QUICK HDOF TO TWR WITH NO FREQ COUPLED WITH NO APCH CHARTS AND AN UNFAMILIAR LAYOUT OF THE AIRFIELD DIAGRAM. WE ALSO HAD BEEN BRIEFED THAT GYR WAS A NO-RADAR; NO-APCH; VFR ONLY ARPT -- SO UNICOM SEEMED TO MAKE SENSE. I HAD PREVIOUSLY STUDIED THE AIRFIELD DIAGRAM WITH EMPHASIS ON VFR PAST PROCS ON ALTS; RWY LENGTHS; DISPLACED THRESHOLD ON RWY 21 AND PARKING LOCATION; BUT DID NOT NOTICE THE TWR FREQ.