My girlfriends phone was initially financed through Tmobile and payed off/unlocked before bringing it over to Verizon. She transferred her line to her work's Verizon Enterprise account about a month ago and recently got a new iPhone 7 Plus upgrade. Now her old iPhone 6s is locked back to Tmobile again for some reason. I've verified this with sim card testing myself and Apple support confirms they see it locked to Tmobile on their end. I called Tmobile and they don't show any locks from their side, but the phone definitely only activates with a Tmobile SIM in it. Anyone experienced this kind of thing before and have any suggestions?