Hi!
Certain background sounds may be perceived by the person with whom you are having an ongoing conversation.
We would need a little more information about what kind of sound you mean, as well as more detailed information about how the call is perceived to be able to take a closer look at this.
If you wish to get in touch with our support for further guidance, you are most welcome to contact us.
The contact information for each country can be found via the links below.
SE: https://www.samsung.com/se/support/contact/
NO: https://www.samsung.com/no/support/contact/
DK: https://www.samsung.com/dk/support/contact/
FI: https://www.samsung.com/fi/support/contact/
We wish you a continued pleasant day! 
/Madeleine
