I am planning to buy the latest iPhone but I am scared to face the similar problem had with iPhone X, since I had problem of clear voice to the call receiver, and I tried to test call with iPhone11, I faced the problem, I am using iPhone 6 okay

I am planning to buy the latest iPhone but I am scared to face the similar problem I had with iPhone X, and iPhone11 which I tested. My problem is that my voice clearness to the other end (receiver), I complained to iPhone service team in Bahrain during its warranty period, with thanks they twice replaced me with new mobile, each time I got replacement after 3 weeks, so that made me to believe that it’s my voice tune is my issue with the newer iPhones since the same mobile didn’t not have the same issues with other users, Note:- for your information up to now I am using iPhone 6 without any issue.