How much can I call and surf abroad with the 85 GB subscription?

Up to 31 GB there are no additional costs for the EU.

Your usage within Belgium isn't included in this 31 GB: only what you use outside of Belgium is. If you use more, every MB used in the EU will be charged at € 0,0018/MB. If you use over 85 GB during your bundle period, both within Belgium and abroad, you'll be able to continue surfing at a reduced speed of 512 kbps.

Outside the EU, the
normal roaming rates apply, and you can’t use your Unlimited 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.