Because some people do not waste money?. I pay 1€ for 1GB of data. Most of the time I use 0MB. Germany.
If it did not take 1 day to activate I would cancel every month and only pay when I actually have a need.
If it did not take 1 day to activate I would cancel every month and only pay when I actually have a need.
At some point extreme frugality like that just means you aren’t a customer at all. There is no app that could satisfy your desire to not waste data transfer.