ZenSim does not offer a true unlimited high‑speed data plan for Austria. The plans that carry the word “Unlimited” in their name provide a fixed limit of 3GB per day; after that limit is reached the speed is reduced to 1000 kbps, so the high‑speed data is still capped.
For travelers needing larger amounts of data, ZenSim offers fixed‑data bundles. For example, the Austria 40GB – 30 days plan supplies 40GB of high‑speed data for a 30‑day validity, and the Austria 20GB – 15 days plan gives 20GB for 15 days. These fixed plans are typically more cost‑effective unless a user expects to consume far more data than the daily 3GB allowance.