SMS Themes 2021 is a free personalization app that allows you to customize your text messaging app on your Android device. With this app, you can change the way your messaging app looks by choosing from a collection of HD graphics and fonts.

To use SMS Themes 2021, simply download the app from the Google Play Store and open it. From there, you can select your preferred theme and set it as your active theme. The app also includes instructions on how to download a compatible messaging app if you don't already have one.

In addition to its customization features, SMS Themes 2021 offers message encryption and privacy protection, as well as keyword blocking and blacklisting to filter out spam and unwanted messages.

Overall, SMS Themes 2021 is an excellent app for those who want to personalize their text messaging experience on their Android device.