I have been encountering a problem with supplementary services (call forwarding and all) on SIM slot 1. I searched for a long time to look for the cause, but didn't get any luck until today.
I think most of you are using Samsung Band Selection(SBS) app to maximise internet speeds on phones that do not support carrier aggregation.
When I restrict my phone to connect to a single band, the supplementary services of that SIM slot just says, "connection problem".
I would love to know if any one using SBS incurred the same problem. And if there is any solution to this problem.
We acknowledge your query and apologize for the same. We would request you to register your concern in Samsung Members Application. So, our concern team gets back to you as soon as possible.
Please follow this path to register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Ask questions).
