MeSIM does not provide a truly unlimited data eSIM for South Africa. All of its South‑Africa‑specific plans are fixed data plans that give a set amount of high‑speed data for a specified validity period. For example, the 50GB/3 days, 50GB/5 days, and 50GB/7 days plans give 50GB of high‑speed data for 3, 5, or 7 days, respectively.
Fixed data plans can be more cost‑effective for most travelers, especially those who use a lot of data. The “unlimited” plans that MeSIM lists actually provide a daily high‑speed allowance (such as 500 MB/day or 1 GB/day) and then throttle speed to 512 kbps or 384 kbps once the allowance is reached. If a traveler needs continuous high‑speed data without throttling, a fixed data plan with a large data allowance is the better choice.