How can I check in with my smartphone?
If you want to check in with your smartphone, you can either do it online or use the Brussels Airlines mobile app. In both cases you'll need an internet connection for check-in and to create your boarding pass. But once your boarding pass has been created, you can access it offline too.
If your departure airport is not equipped with a mobile boarding pass scanning system, you'll need to go to the check-in counter or the baggage drop-off point where your boarding pass will be printed for you.