Thank you so much Chris4203!
Could you please suggesting me with another option? I couldn't update my iPhone 12 Pro Max to iOS 15.2.1, because I am using my iPhone 12 Pro Max connecting to my MacBook Pro run by OS Mojava Version 10.4.6 operator systems. I have been using my MacBook Pro to open up iTune for my iPhone 12 Pro Max.
Futermore, my MacBook Pro is build on late 2013, which I couldn't update to the latest version ( Mac OS Big Sur ), because it isn't compatible for the MacBook Pro build on late 2013. I would like to be able to talk on the phone with handsfree while I am driving my car. Hopefully you can help me! Thank you in advance.