07-06-2018 09:09 PM
It should do as long as roaming is activated on your account. Prices for roaming in Cuba (which are very expensive) can be found here.
08-06-2018 08:22 AM
Welcome to the community, I'm so jealous that you're off to Cuba. 🙂
You can check if your roaming is set up through the manage device section of My EE.
Costs and add-ons can be found on the page that @Profile closed referred to above.
Have an amazing time. 🙂