For example in Finland almost all plans are unlimited and users regularly use a lot of mobile data. Average monthly use is 34 GB and median 6 GB [0]. The cheapest mobile plan I can find is 9.90€/month for unlimited data at 1 Mbit/s [1]. Dividing it by 6 GB median data use gives $1.95 for 1 GB which is close to the their reported minimum price of $1.75. However if this plan was instead marketed with 100 GB monthly cap they would have divided it by 100 GB instead giving a much cheaper price.
[0] https://blog.telegeography.com/finns-lead-the-way-in-mobile-... [1] https://elisa.fi/kauppa/puhelinliittymat