I am sure it happens with Android too. My previous car was an Altima. I had my iPhone 8 plus with that car too. Never an issue. I am still using that iPhone now on my Rogue and I have the issue. Clearly is not an iPhone issue.
Solved - Technical Service Bulletin Issued for Rogue
Provide the dealership with the below details. Unfortunately I can't post the URL due to lack of post history.
August 29, 2018 MANUFACTURER COMMUNICATION NUMBER: NTB17-097A
Components: EQUIPMENT ADAPTIVE, EQUIPMENT
NHTSA ID Number: 10144515
Manufacturer Communication Number: NTB17-097a
2016-2018 ROGUE AND 2017-2018 ROGUE SPORT; WHISTLE NOISE TRANSMITTED TO CALL RECIPIENT WHEN USING BLUETOOTH HANDS-FREE PHONE SYSTEM
This bulletin has been amended. Changes have been made throughout. It is necessary for you to read this revised procedure to properly perform this action. Please discard all previous versions of this bulletin.