ETECSA commercializes 3G Internet in cell phones since December 2018. In October 2019, they added 4G/LTE.
To activate the mobile data you need to know a few things:
Requirements to access the Internet for data in Cuba
You must have a cell phone that connects to 3G on the 900Hz band and 4G on the 1800Hz band. (In phones sold by international companies, this detail needs to be reviewed, because companies often restrict the spectrum of bands on the phone).
You need to activate the APN Nauta. Users in Cuba who use Nauta mail already have it activated (see instructions for Android and iOS). If you don't have Nauta mail, activate the APN and use the data network to access free sites like etecsa.cu
How to activate Cubacel's Internet?
If you meet the two previous points and you also have available credit, you have very little left to use Whatsapp in Cuba 😉
Just dial *133#
In the menu, you have two options to purchase mobile data, Data, or Plans (Data + Voice + SMS).
There you will find the 4 options to activate the Internet.
Either of these options allows you to use messaging apps and surf the web, but it's good to keep in mind that buying LTE packages is much cheaper.
Remember: Option 4 LTE Packs are only available to 4G users.
Option Plans (Data + Voice + SMS)
This offer has become the preferred one for 4G network users, with cheaper prices about the amount of megabytes/gigabytes purchased.
Mixed plans have also become more popular with 3G-only users, who add this option to the Pay-as-you-go and Mailbag as the only ones available to them in Data.
If you want to know more you can visit Fonoma Blog.