Three previously required iPhone customers to use its free Three inTouch app for Wi-Fi calling, but the carrier settings update released on Friday introduces system-level support for Wi-Fi calls and texts under Settings > Phone > Wi-Fi Calling.
We k**w that sometimes you can't get signal when you're indoors, but that shouldn't mean that you have to go off the grid. With Three inTouch Wi-Fi Calling, you can call and text whenever you're on Wi-Fi in the UK, even if there?s ** mobile signal.