Iggidy :
GUYS I FINALLY GOT THEM TO UNLOCK MY IPHONE 6!! HOPE THIS HELPS, JUST CALL CUSTOMER SERVICE AT SPRINT AND CAUSE A RUCKUS! I TOLD THEM I CONTACTED THE FCC AND ATTORNEYS GENERAL AND MY LAWYER ALL HAVE THE CASE ON STANDBY IF THEY DIDNT AUTOMATICALLY UNLOCK IT...I PAID EVERYTHING OFF AND THEY FED ME A RUN AROUND SAYING 3 DAYS IT WILL UNLOCK AFTER READING POSTS AND REALIZING THEY WERE BREAKING THE LAW, I PRESSED THEM AND TOLD THEM I WAS SUEING AND ALREADY HAD A PENDING CASE, THEY PUT ME ON HOLD PRESSED SOME BUTTONS AND UNLOCKED IT. I INSERTED MY T-MOBILE SIM CARD AND WAS GOOD TO GO. SPRINT GETS SALTY AND SENDS YOU THROUGH LOOPS WHEN LEAVING NEVER WILL I EVER GO BACK WITH THEM! JUST CALL AND CAUSE A RUCKUS AND THREATHEN THEM WITH A LAWSUIT AND THEY WILL GIVE IN!
I saw this post and tried it myself. SO FUCKING TRUE!!!
I moved out of the country and cancelled my contract with Sprint in 2014. Whenever I'm home in the US, I want to use my iPhone 6 on a prepaid SIM card but every time I called, Sprint kept telling me that "they've put in a request to unlock" my phone and I should hear back within 72 hours. I even got so frustrated that I went to T-Mobile and Apple stores to help me talk to Sprint.
Two "case IDs" and 10 phone calls later, I had enough and LOST MY MIND ON THE PHONE. I informed them that I was recording our conversation, discussed the FCC Unlocking Law (https

/www.fcc.gov/consumers/guides/cell-phone-unlocking-faqs), threatened to have a conference call with Apple customer support and my lawyer and they FINALLY unlocked it 45 minutes into my 10th phone call as of January 2017.
Although they confirmed that they have unlocked the phone from their end, they will STILL tell you that they "cannot guarantee" that it will work on another carrier. When they tell you this BS, tell them that you will have Apple support and your lawyer on a conference call with them so they can explain this "technological" issue.
DO NOT HANG UP THE PHONE WITHOUT CONFIRMATION OF YOUR UNLOCKED PHONE, CASE ID & THEIR SUPERVISOR NAME.
I wish everyone the best of luck with unlocking their Sprint phones. DO *NOT* GO NEAR SPRINT EVER AGAIN!!!