Please reset network setting of both Sim one by one and than reset all settings of your's device in general management settings also Flight ✈️ mode on n off one time, restart your's device without any Sim in slots also interchange Sim in slots, turn off power saving mode. Then try to it's again. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
As per your concern, we would request you to kindly perform the following steps to resolve your issue.
Clear app cache through Device care: Settings > Device care > Storage > CLEAN NOW. Note: To delete files or uninstall apps that you do not use anymore, select a category under USER DATA. Then, tick items to select and tap DELETE or UNINSTALL.
The clear cache memory of a particular application: Settings > Apps > Now pick the app that you like to clear off the cache memory > Storage > Clear Cache.
Reset the device Settings: Settings > General Management > Reset settings>Reset all settings to their default.
For Wi-Fi calling you must have the following requirements.
1-Access to a Wi-Fi router with a high-speed internet connection (Any ISP Router) 2-Wi-Fi calling enabled smartphone. 3-The latest software needs to be updated. 4-The Wi-Fi calling switch should be on. 5-You should use Airtel 4G SIM (VoLTE Support) Or RJIO SIM Card + VOWIFI should be enabled for the user by the operator end as well. For a seamless experience, You should keep both VoLTE and Wi-Fi calling switched on.
Enable the Wi-Fi calling feature via settings: Settings> Connections> Wi-Fi Calling> Turn on Wi-Fi Calling> Wi-Fi Calling feature has been turned on.
Enable the Wi-Fi calling feature via the Notification panel: Notification panel> Wi-Fi Calling to enable> Wi-Fi Calling has been enabled.
Enable the Wi-Fi calling feature via the Phone App: Phone>Menu> Settings> Wi-Fi Calling> Wi-Fi Calling feature has been turned on.
In case the issue still occurs please visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
