One week now everything is ok. I have no issues with calls. The phone is very good and beautiful in white that I got. In terms of speed, it is very good with 8 GB of RAM, to find something better you have to go over 250 euros. And of course, it is not a gaming phone. If it has any issues with calls, I will mention it. Finally, after the second week, I also had the same problem with calls. And as time goes by, it gets worse. It's a shame. It's going back for a refund.
Update... 22/06/24 after two returns, they fixed it for me (they didn't want to refund me) the problem it had is gone (about 25 days in operation) and the phone is ok. Guys, it must also play a big role if you have an old sim card. I happened to change provider and also changed sim card with new ones. This must have played a role too. Now the phone is fine. For its price, it's ok. And it's very beautiful in white. The negative thing I find is that the battery doesn't last long.