As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SAT PHONE INOPERATIVE, STATES NOT READY ON SAT 1 & SAT 2 BOTTOM PAGE ACARS SAYS NO NUMBER UNABLE TO MAKE SAT PHONE CALLS. GROUNDED - YES. FOUND IRIDIUM TRANSCEIVER IN A LOCKED UP STATE. CYCLED 1 C/B. REF B737-800 FIM 23-15- TASK 801. ACCOMPLISHED OUTGOING AND INCOMING CALLS VIA SATCOM; LOUD AND CLEAR. OPS TEST GOOD. REF B737-800 AMM 23-15-00. GROUND VERIFICATION TESTS GOOD.