I have some very unusual problem with my SIM or my phone. The problem is that my Jio sim(on roaming) doesn't support volte in my Moto Z but when I insert it in someone else's phone, it shows the volte functionality. The weird thing is that when I insert some other Jio SIM into my Moto Z, I get Volte support. I have tried this with multiple Jio SIM cards as well as multiple mobile phone with all right settings. It appears as if somehow my phone and my jio sim is not compatible. But I don't know how could it be possible.
I didn't find the right solution from the Internet.