As mentioned in the title, I am facing a weird issue. Here is a breakdown of it.
1. Was using Jio (slot 1) and BSNL (slot 2) on Lenovo phone. 2. Moved the two SIMs to Samsung M30s. 3. Jio - Data works. But calls won't. Whenever I try to make calls, the device immediately disconnects and shows `Network busy`. And sometimes shows `IMS services keeps stopping` message.
The only way I could make Jio voice work is if I disable BSNL SIM from the settings.
For reference, these are all the brute force attempts I have tried so far,
1. Tried swapping the SIM slots. 2. Turning off and turning on a thousand times. 3. Wiped the cache partition twice.
Settings tried,
1. Network mode - BSNL - 2G Only. Jio - LTE/3G/2G (auto connect) 2. Network mode - BSNL - 2G Only. Jio - LTE Only. 3. Turn ON and OFF the `use mobile data during calls` setting. 4. Changing the preferred sim back and forth.
I am not able to use the code `*#*#4636#*#*` either. It simply dials. In One UI 3.0, the VoLTE settings is missing too.
I have spent almost a day on this, I contacted Jio, Samsung, and BSNL. None of them can provide a solution. Can someone please help me figure out the issue?
