No, they have a genuine unlimited plan (for on-device data) these days. The only exception is if you are connected to a congested tower and have used more than

No, they have a genuine unlimited plan (for on-device data) these days. The only exception is if you are connected to a congested tower and have used more than 21 GBs your traffic will be de-prioritized (which in practice means under 100 kbps throughput).