No fixed data cap, but speed can drop after a threshold or under a fair usage policy.
An unlimited plan does not stop when you reach a data amount. Most of them still have a speed rule: after heavy use the connection slows down for a period.
That is usually fine for maps and messaging and harder for video calls and large uploads. Hotspot sharing is often limited too.
What to check
- Read the fair usage rule and the hotspot cap before you buy
- Compare price per day, not price per GB, because there is no GB figure