Thank you for reaching out to the Samsung community! We would like to inform you that WI-FI calling depends upon the network service provider, so we suggest you to kindly contact the network service provider support team.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
