Remember the other day when we said EE's seamless WiFi calling feature was launching on April 10th? Well, there's been a slight change of plan, as the service is available right now on compatible iPhones (the 5s, 5c, 6 and 6 Plus). WiFi calling was originally supposed to launch alongside the Galaxy S6 and S6 edge in a couple of days, and we had no concrete details of when Apple devices might be joining the fray. That's changed today with the release of iOS 8.3, however, which adds support for EE's WiFi calling feature, among other things.
To get it working, first you'll need to update to the latest version of iOS, then allow WiFi calling within the "Phone" settings menu. EE will need a couple of hours to do, well, whatever it needs to do on its end, and you should be good to go. Be warned, though, that to manage bandwidth effectively, EE's limiting the amount of iPhones that can register for WiFi calling to 100,000 per day. So, unless you're quick on the trigger tonight, you may have to wait longer than a few hours 'til your handset is fully capable.