I am trying to change the APN settings to ipv4/ipv6 but when I open the APN settings from the settings menu it shows a lock next to the T mobile APN. It's a developer edition purchased from HTC so it's not locked. I am using it with T mobile. The option for changing the APN is greyed out. I guess I can manually enter the APN ad a new APN. Has anyone else encountered this. I did a Google search but only come up with an issue with Verizon version.
Does anyone have the T Mobile US APN handy? Also look at the screen shots I attached.
Sent from my HTC One_M8 using XDA Premium 4 mobile app