The Samsung Galaxy S9 and S9+ are powerful smartphones, perhaps the most powerful mobile phones ever sold. As of the publication of this book, the Galaxy S9s are the standard against which all other Android-based phones are measured.

Each cellular carrier offers a slightly customized version of the Galaxy S9 line-up. Some phones from cellular carriers come out of the box with preloaded applications, games, or files. Most come with accessories, such as a corded headset; others don’t. This book doesn’t dwell on these kinds of differences.

The name for each network is different, these phones are largely the same. (At least one marketing person at each cellular carrier is cringing as you read this.) This similarity allows me to write this book in a way that covers the common capabilities.

At a more core level, these phones are built for high-speed wireless communications. The cellular carriers have spent kajillions upgrading their networks to offer more coverage and better data speeds than their competition. Again, this book doesn’t dwell on these differences in network technology because they don’t really make much difference. (Again, at least one engineering person at each cellular carrier is cringing as you read this.)

Similarly, most of the capabilities of the Galaxy S9+, with its bigger screen and three camera lenses instead of two, and the Galaxy S9 are identical. When there is an important distinction between the S9 and the S9+, I will mention it. Otherwise, ...

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