WiFi calling not working
Local mobile tower been down for 3 days but WiFi calling not working
iPhone 11 Pro
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Contact your Carrier (Cellular Service Provider) The agency who issued the SIM to you as WiFi Calling is carrier specific feature --> Make a call with Wi-Fi Calling - Apple Support
An extract from the above link.
"To use Wi-Fi Calling, you need an iPhone 5c or later on a supported carrier."