Data plans exists, but there is no good middle ground. You have the unlimited 4g connection for 20 USD , or the WhatsApp only for a few dollars.
Most of the people, specially older age or people who already have unlimited data from work phones, do not need 4g unlimited connection, so why spend extra 15 USD (which is a lot in latin America), if you can still communicate perfectly fine via WhatsApp.
Data plans exists, but there is no good middle ground. You have the unlimited 4g connection for 20 USD , or the WhatsApp only for a few dollars.
Most of the people, specially older age or people who already have unlimited data from work phones, do not need 4g unlimited connection, so why spend extra 15 USD (which is a lot in latin America), if you can still communicate perfectly fine via WhatsApp.