Follow the instructions on the video and then restart your iphone to get rid off call failed error during a call / call set up.

For other verison of iOS:
iPhone 7 to newer: Upgrade to iOS 13 and follow the procedure on this video. Ortherwise use 3G network instead of 4G ( If there is no such setting).
Older to iPhone 6: Use 3G network instead of 4G. ( If there is no such setting).

If problem still exists turn Off Show My Caller ID.

Note: You have put Mobile Data ON for one time to get this setting to 4G Off VoLTE off.

#iPhone #iOS13 #iPhoneCallfailed #CallFailed #iPhoneX #iPhone11

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