I have a 70 GB data bundle, and still I have to pay for data. Why?

Have you recently been abroad, or are you still? This is why: up to 27 GB there are no extra costs for using data in the EU. If you use more, every used MB will be charged at € 0,002/MB.

Outside the EU, the normal roaming rates apply, and you can’t use your 70 GB data bundle.
Do you really want to use mobile data outside the EU? That’s possible! With the Global Data Pass you can use mobile data in many countries outside the European Union. You can find all the details here.