It may happen that you end up with your smartphone in a place where no internet access is available.
Do not panic ! You can still view your favorite websites in offline mode, for example Wikipedia articles. You just need to use a android site vacuum. For this, the HTTrack Android application is the best in this area
HTTrack is a handy little application that allows you to configure several sites and the level of depth you want to recover just as you can do with a website vacuum cleaner on Windows. You can then access websites on your mobile device, even when you do not have an Internet connection.
When you connect to the internet, the application retrieves the pages and images of the site (but not the videos). And it will then be searchable even when you are offline. Convenient for journeys by train, plane or in small villages.