Originally Posted by
Zahid Khan10 Thanks for the advice. My problem was also exactly same but your trick worked. I removed the country code and called, it worked. Thanks again.
If anyone is still having this issue, I have a Samsung S8 and experienced the same. I tried everything but finally found something that worked for my phone. I went to "settings" and then "connections." Then I found"mobile networks" and "VoLTE calls" was enabled. I disabled it (just switch off the toggle) and I could make the call. I then enabled it and could still make the call so perhaps there was a glitch of some kind?
Hopefully this helps as it was hugely frustrating.