What happens when you hit cap on free plan?

Since data is the easiest one to hit the cap, what happens when you hit the cap? Does it stop?

From the FreeUP website FAQs:
"I ran out of minutes, texts or data, how do I get more?
If your Minutes, Text or Data get used up during the month,you can pay or apply rewards point to purchase add-on to your account to continue using the services. Any unused portion will expire at the end of the billing cycle and will not roll over to the next cycle."

Until you buy more.