Htc m9 sprint simlock enabled

[JulioGeeee]

So i've been trying to solve this issue and finally came to a dead end.
I have att and this phone is sprint. i already purchased an unlock code. i tried to contact sprint but they said since i dont have an account with them they cant help me. even though my phone clearly says to contact sprint. i have s off and downloaded a custom rom. i still cant get this sprint stuff off. ive looked online and cant seem to find an answer to my problem. if anyone can help i would greatly appreciate it.

 

[IAmSixNine]

The problem is you purchased a CDMA/LTE phone when you needed a GSM/LTE phone.
Sprint and Verizon are CDMA and ATT/TMO are GSM based.

 

[JulioGeeee]

The problem is you purchased a CDMA/LTE phone when you needed a GSM/LTE phone.
Sprint and Verizon are CDMA and ATT/TMO are GSM based.

Actually the phone has both GSM and CDMA. There's an option for it in the settings . But it's greyed out so I can't access it. I believe the HTC ones are one of the only phones with both CDMA and GSM capabilities