Using Elevate on a phone
Data, screen size, and what works offline.
Technical
Every screen works on a phone. It is built for that first, because that is what most people here use.
Video is the only part that uses significant data. Reading the curriculum, submitting work and taking part in a discussion are all light.
There is no offline mode yet, and no installable app. Both are planned; neither exists today, and we would rather say so than let you find out on a matatu.