Shockingly to some, the level of network development, especially wireless network, is not the same everywhere. Even population density varies greatly. I just checked our operators, the cheapest mobile plan comes at 1 GiB of data per month. Prices climb really fast after that, making 10-15 GiB (or more) too expensive for many, though you can get 5 GiB/mo subsidized for cheap if you have some sort of disability.