I tried to fix each problem to help me fix it into the Bluetooth connection. Turn off the system (phone) in the Bluetooth system. It can make the show name normal but can't answer the phone. Can't make a call. Reject only the call. 1. Android system 9 cut because the system can be named as normal. 2. Bluetooth is not yet. Sure 3. The pure Android app (phone) system 9 has a problem. I think in my opinion we come to help fix more. Please help. I'm sorry. In my English I'm not strong.
Thanks for reaching out. This forum is for support of US products and customers. As your product is a non-US model and support for these models is very limited, please seek a support team for your area. You can do so by using this link: https://www.samsung.com/us/common/visitcountrysite.html
Samsung devices vary by the area they are produced for. There are software and hardware differences. This is why it is necessary to seek support from the originating country of origin.