I have the exact same issue with the exact same model i just bought this weekend. Please let me know if some one has already found a way without routing or flashingAfter the Oreo update this Morning I tried to enable volte and video calling on unlocked firmware which is U1 but the shortcut Master app does not let you get into IMS settings anymore. Also tried using the quick shortcut maker app with no success. Just a heads up for people updating to Oreo using U1 firmware. Just for reference this is on the T-Mobile network on the US unlocked snapdragon. If anybody has any input or could figure it out that would be awesome if not I will probably end up flashing the T-Mobile Oreo CSC which will give me the T-Mobile boot animation which I don't want.
Thanks a lot
Andres

