T-Mobile's 15GB International Pass includes the following features for a period of up to 30 days and in 210+ supported countries while traveling abroad:
If you consume all your high-speed data, you may experience slower data speeds. If you consume all your high-speed data and purchase a second 15GB international pass before your first pass expires, then the new pass will start immediately and your 10-day period will reset.
Learn more about T-Mobile's international data passes here.