Using an iPhone on Sprint? Good news: you just got WiFi calling. If you install both the iOS 8.3 update and a matching carrier profile rolling out this week, any iPhone from the 5c on up can make voice calls on Big Yellow using a WiFi hotspot. As on other devices (and T-Mobile, or EE in the UK), this is all about giving you calls in basements, big offices and other places where you might get flaky reception. The upgrade won't help you much if Sprint's coverage is less than stellar in between the access points you use, but at least you won't risk missing an important chat because you're stuck in a cellular dead zone.
Photo by Will Lipman.