ZenSim does not offer a true unlimited data eSIM for South Africa. All available plans have a fixed data allowance. The plans that use the word “Unlimited” in their name actually provide 2GB/day for 10 or 30 days, after which the speed is reduced to an unspecified lower tier.
Fixed‑data plans provide a more predictable cost per data amount. For example, the 20GB plans are available for 10 days at $36.00 USD and for 30 days at $41.00 USD, while the 10GB plans cost $23.00 USD for 10 days and $24.00 USD for 30 days. These are among the larger‑volume options on ZenSim’s South Africa catalogue and can prove more cost‑effective unless an extremely heavy data user is required.