Please tell us some basic information before asking for help:
Model Name: ROG 5S
Firmware Version: 31.0810.1226.91
Rooted or not: Not rooted
Frequency of Occurrence: Ongoing
APP Name & APP Version (If your issue relates to the app): VoLTE
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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ROG 5S 512GB model in Australia.
When it was on Android 11, special code was required to enable VoLTE (Shows as "Call on 4G" in setting) - VoLTE did not work. Network drops from 5G to 3G when on call.
After upgraded to Android 12, "VoLTE" option is available in setting without special code - VoLTE still does not work.
Some reported that VoLTE works without issue in Australia with Telstra (Telco).
My previous devices such as iPhone 11Pro Max, 13 Pro Max, Galaxy Z Fold 2 and 3, Pixel 6 Pro had no issue with VoLTE with same SIM card with same service provider - Telstra.
Can someone confirm if this is the issue with the device or VoLTE does not work with Telstra? Because VoLTE works with Optus.
