Install iOS 12.1.4 for Sprint VoLTE Support
If you own a newer iPhone model on Sprint, and you skipped iOS 12.1.1, iOS 12.1.2 and iOS 12.1.3, you should consider installing iOS 12.1.4 today because it brings VoLTE support.
VoLTE stands for Voice Over LTE and it lets you make higher quality phone calls over the carrier's LTE network. Of course there are a few caveats.
First, VoLTE needs to be live in your market. It's currently live in several cities across the United States, but some cities must wait.
It only works with newer iPhone models on Sprint. In addition, the person on the other line needs to have a newer iPhone model running iOS 12.1.1, iOS 12.1.2, iOS 12.1.3, or iOS 12.1.4.
If you want VoLTE and you have a compatible device, you'll want to download iOS 12.1.4 today.