Thank you for reaching out to the Samsung community! We would like to inform that Galaxy Note 5 supports VOLTE network. If you are facing any issue while using VoLTE network kindly follow the below mention steps to overcome the Issue;
- Check by using any other SIM card. - Ensure that network frequency of your device should be selected on Auto-mode. - Menu > Settings > Connections > Mobile Networks > Network Mode > Select auto mode (GSM/WCDMA/LTE). - Search for the Network Manually as follows: Menu > Settings > Connections > Mobile Networks > Network Operators > Select Manual Search. - Do reset your device on factory mode after taking the data backup Via Smart switch and remove the Google account.
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#/