The Marvel Unlimited subscription service is accessed by streaming the comic content from the internet.
With the Marvel Unlimited mobile app, you can select up to 12 issues to read offline. These issues will be temporarily downloaded to your mobile device so that you can read them without the need for a wi-fi or cellular connection.
In order to read a comic while your mobile device is offline, add that comic to your library by tapping the comic, then tapping the "Add to Library" button. Once a comic is added to your library, you will see an option to "Read offline?" Simply turn the switch to "on," and that comic will be downloaded to your device. You will be able to see all your comics for offline reading in the "My Library" section on your mobile app.
You may choose up to 6 comics at a time to read offline. Reached your max? Don't worry — you can always delete comics you've already read by going to the "My Library" section and clicking "Edit." Once you've deleted comics from your read offline queue, you can add more issues.