EE's been talking about adding WiFi calling to its list of customer conveniences since last summer, and though slightly delayed, the feature is now ready for prime time. Well, almost, as WiFi calling will officially launch on April 10th, coinciding with the release of Samsung's Galaxy S6 and S6 edge. These flagships, alongside Microsoft's Lumia 640, will be the first phones capable of using the feature, though it'll become available to a slew of compatible handsets "in the coming weeks." You may be wondering why so few devices are supported at launch, and the answer lies in how EE has implemented WiFi calling on its network. Where O2 and Three have created smartphone apps that let their customers make calls over WiFi, EE's solution is completely seamless. No intermediary app is needed, meaning you'll be able to make and receive calls and texts over WiFi as you would normally, using your phone's regular dialer and messaging app. Provided you're a pay-monthly customer, that is, since the feature's not available to pay-as-you-goers.