Jio VoLTE not working (data works however) when there is a second SIM ON

[kenomatic]

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?

[kenomatic]

Hi @ajitsaria. Really? I've been pulling my hair out for five hours straight. Calling all customer cares. What seems to be the issue? Can you update me once they provide a solution. Jio care keeps hanging up when they can't provide a solution. you got lucky.

[TechiePradhumn]

Dude How You Wipe Cache Partition?

[kenomatic]

Hi. Please start a different thread for your question. As for the question, here is the link - https://www.hardreset.info/devices/samsung/samsung-galaxy-m30s/wipe-cache/

[TechiePradhumn]

Reply Me Here

[kenomatic]

Is it just voice not working, or both voice and data? For me it's just voice. Unable to make outgoing/incoming calls.

[kenomatic]

Thank you for the information. If it isn't too much to ask, please do provide any updates on this issue. Thanks a lot.

[sandygupta]

I am facing sane issues on my galaxy a7, data is working but call keep disconnecting with call ended. I have tried some trick from you tube doesn't work any of them. any suggestion

[Avyn]

same issue, but with Airtel Sim.

[Samsung_Support1]

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-network-issues/#:~:text=1%20Check%2....

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support