Lempart Flex offers ultra-affordable unlimited data abroad: choose how much full-speed data you get each day (500 MB to 10 GB), the speed after it (up to 384 kbps, 512 kbps or 1 Mbps) and 1 to 30 days, and pay only for the speed you need. Plans cover 200+ destinations, every plan includes personal hotspot, and there is no subscription. Buy on the website without an account or in the iPhone app; the eSIM arrives in about a minute.