Some Android devices like Samsung phones have this setting hidden in the Phone app. How to find it:
- open this phone app, tap the three-dot icon in the top-right corner, then tap the settings.
- If you see an option for WiFi callsTap on it and turn it on.
- If you don’t see them WiFi calls possibility one the settingsSeek Calls or calling accounts and then tap yours SIM card (Your carrier’s name will be displayed next to it).
- When it’s available you’ll see WiFi calls next to your network operator’s name in the extended notification bar on your phone.
Can’t find the option on your Android phone? You need a SIM card in your device for the option to even show up. (Once you insert one, you may need to restart your phone.) If you already have a SIM card, open it the settings and type “WiFi calls‘ in the search bar at the top. If you still can’t find the option, you should check with your carrier and make sure Wi-Fi calling is enabled on your account.
What you need to know about WiFi calling
Wi-Fi calls are usually included with your existing voice calling plan and count as regular calls. If you have limited minutes, Wi-Fi calls will likely count as part of your allowance. They shouldn’t incur any additional charges, but we recommend you double-check as carriers don’t always treat them the same way. If your provider charges for WiFi calls, it’s time to find a better provider.
One thing to note is that any long-distance or international charges you incur for voice calls are likely to apply to Wi-Fi calls as well. And WiFi calling is not supported in every country. Alternatively, try using the calling feature (voice or video) in internet protocol messaging apps like WhatsApp, Google Duo, Telegram, Signal, WeChat, and FaceTime. You will not incur any fees.
Carriers dictate exactly when your phone should switch to Wi-Fi calling, but that’s not very consistent. If you find that your signal is just strong enough that Wi-Fi calls aren’t working, but not good enough for clear calls, you can force it by turning Airplane Mode on and then turning Wi-Fi back on. Just remember to turn Airplane mode back off after the call.
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https://www.wired.com/story/how-to-use-wifi-calling/ How to use wifi calling on your iPhone, Android phone or tablet