As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SAT PHONE DID NOT WORK IN FLIGHT. TRIED BOTH SAT 1 AND SAT 2. HAD "SATCOM VOICE UNAVAILABLE" AND "NO SERVICE" MESSAGES INTERMITTENTLY WHILE TRYING TO CONNECT/TALK. GROUNDED - YES. PER B737-900 FIM TASK TASK 23-15 TASK 801, SAT 1 & 2 COMM OPS CHECKED SUCCESSFULLY WITH DISPATCH, VERIFIED AUDIO WAS LOUD AND CLEAR.