@Julia *********
I have post paid because I use the plan for my Apple Watch too.
But I have a cheap 40 GB because I have WiFi in home and in almost all cafe, malls etc.
I don’t know how to use more than 20 a month, even with holidays when the hotel has poor wifi and I use the hotspot for the kids.
Edit: I have a plan that doesn’t exist anymore (i believe). It’s called flexi and I can switch between 2,4,8Mbps and full speed. After the first year of fearing the run out of data, I switched to max and never switched back.