Are your minutes unlimited?

No. Starter includes 150 minutes a month and Growth includes 600. What does not run out is your line: on a paid plan it carries on picking up after those minutes are used.

We warn you at 80% of your allowance and again at 100%, so you can decide whether to move up a plan. If you would rather stay where you are, nothing changes and your line keeps answering. We don't bill per-minute overage, there is no setup fee, and there is no month in which your phone goes quiet because a meter ran out.

The free seven days are the exception, and they are the one time the line does stop. The trial has its own smaller allowance, 35 minutes on Starter and 140 on Growth, and once it is used the line stops answering until you start your plan. Starting it brings the line back with a full month of minutes.