asus Zenfone max pro m1 software version 087 doesn't support Vodafone-idea (vi) volte. Please solve the problem next update. please solve the problem with high priority because volte is a day to day life vary important feature
İt may be working without showing it. Back in pie, my phone didn't show volte symbol but had volte working properly. Easy way to check is; make a call on 4g, if it drops to 3g or 2g, it's not working, if it stays on 4g, then it's working.