Here are a few articles on the Android Nougat OS encryption including a comparison of encryption options on the iPhone. It is not enough to say or know that your phone has encryption, the real question is how is the encryption technology deployed in each circumstance. When it comes to security, there are always tradeoffs between security and functionality or performance. If you are selling phones, you want to sell something that performs well and is secure.
Windows IP Pro site
Matthew Green’s blog