If you want to stay connected on your trip to Cuba you have three options:
You can use the roaming services of your telephone company, if it has agreements with ETECSA.
I want you to be warned: it does not usually go cheap💰
But sometimes it is affordable and has the advantage that you keep your phone number and don't have to change your SIM card.
There is the possibility of acquiring a non-permanent line with a duration of 30 days
For now it can only be purchased upon arrival in Cuba, or on the Cubacel website www.cubaceltur.com
This line has included the offer of 2.5GB + 20 MIN + 20 SMS, and its price is 25USD.
It is a new service, and if you want more info you can go to this link or ask us. We will help you in everything that is in our hand ;)
With the third option, viable with your identity card or Cuban passport (or even with the passport of another country), you can get a permanent Cubacel cell line.
You already have it? Now make sure your smartphone works on the Cuban 3G /4G network, then configure the APN Nauta, and finally dial * 133 # to buy data plans. More info.
Don't you want to get a permanent line? At the airport, upon arrival, you can buy a card to activate a Cubacel timeline, with which you can activate the Internet with the same conditions as I already explained.
I wish you are traveling to Cuba soon!