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VoWifi Calling Issue after recent update

Star I
Today I got new update of approx 185mb
After updating, some issues got solved like over heating, slow booting, slow charging, these issues seems solved
But new feature - Wifi calling is not working properly
I have 2 sims, 1. Jio, 2. Airtel
Only Jio sim is showing wifi calling option, its not available for second sim of Airtel
Second thing is its not working, its just showing wifi calling sign for few seconds on status bar then disappear & turns to VoLTE
Third strange issue is when my phone is on airplane mode than it sometimes shows VoWifi Sign in status bar even in airplane mode ! & guess what, I can make/receive calls on VoWifi in airplane mode
So when it is needed in normal mode it don't work & when there is no need in airplane mode it sometimes works forcefully
Check both screenshots
1. Is of airplane mode
2. Normal mode


Star I
Ok sir, my wifi router will be max 10sq foot away from my bedroom, it shows full range in icon, but I will try solution you said
But sometimes it shows vowifi icon even in airplane mode & I am able to receive & make calls in airplane mode
I had attached screenshot of it