My travel add-on to Brazil is not working and I don't know what to do!

I bought a Brazil travel add-on before I left and now that I am in Brazil I can't get my phone to work. It only connects to the internet if there is a free Wi-Fi connection, so I can't use any mobile data. Which means that I can't use Google maps to get around the country... How can I get my travel add-on mobile data to work?
I've got a Samsung Galaxy J1(6) phone, if that matters. Thanks for the help!

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