To enable Wi-Fi calling on your iPhone or Android phone in the UK, please follow the steps below:

Enabling Wi-Fi calling on an iPhone:

• Open the Settings app on your iPhone.
• Tap on the "Phone" option.
• Tap on the "Wi-Fi Calling" option.
• Toggle the switch to turn on Wi-Fi Calling.

Enabling Wi-Fi calling on an Android phone:

• Open the Settings app on your Android phone.
• Tap on the "Network & Internet" option.
• Tap on the "Mobile network" option.
• Tap on the "Advanced" option.
• Toggle the switch to turn on Wi-Fi Calling.

Please note that Wi-Fi calling is carrier-dependent, and not all carriers support it. You should contact your carrier to check if WiFi calling is supported on your plan. Also, please ensure that your phone's operating system is up-to-date before attempting to enable WiFi calling.

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Author: Martin West