My mobile data plan is like this. It’s funny because when I’m “out of data” my provider sends an SMS suggesting I upgrade to more gigabytes, but then it still continues to work. And yes I checked my bills to make sure that they are not charging me for any usage excess of what’s included in the plan. It’s not even particularly slow. I can still browse the web, send and receive WhatsApp messages, images and videos, watch videos on TikTok etc.
My current plan is 2GB with rollover. Last month I used 2.5GB, and somehow this month has 2GB included + 2GB rollover = 4 GB available which by itself is also weird. Maybe most of the 2.5 GB I used last month was rollover from the month before that or something.
In total I have used 4.6 GB of mobile data so far this month, which is more than the 4 GB (2+2) I have available for this month and it’s still working.
There are still telcos offering 2GB plans. Wow. I’m on the cheapest plan and it comes with 400GB.
They'd rather you keep paying monthly than start price comparing options.