Volte not working
I turned it on once I got the phone and was able to make voice calls. I have updated the phone since then and mostly been on WiFi. Now when I need to make a call it won't work. I have tried everything thing to make volte appear again but it won't. I dialed *#*#4636#*#* volte provisioned is there but it won't toggle. My sim card uses volte in my Zenfone 3 and it did 3 weeks ago on this phone when I got it. All the 4g lte checker apps say congratulations your phone can use Volte. But I can't. Help please. I'm going crazy trying to figure this out.