The general rule is that as long as you spend more time at home than abroad, or you use your mobile phone more at home than abroad, you can roam at domestic prices when travelling wherever in the EU. This is considered a fair use of roaming services.

If this is not the case, your mobile operator may contact you. Operators can detect possible abuses based on the balance of roaming and domestic activity over a fourmonth period: if you spend a majority of your time abroad and consume more abroad than at home over the four months, the operator can ask you to clarify the situation within 14 days. If you continue roaming more than you are at home, your operator may start applying a small charge to your roaming consumption:

€0.032 per minute for voice calls (+ VAT)

€0.01 per SMS (+ VAT)

€3.50 per GB of data (+ VAT)

The surcharges for mobile data gradually reduce each year. The maximum surcharge was €7.7 per GB (as of 15 June 2017), falling to €6 per GB (as of 1 January 2018), €4.5 per GB (as of 1 January 2019), €3.5 per GB (as of 1 January 2020). The surcharges will be capped at €3 per GB (as of 1 January 2021) and finally €2.5 per GB (as of 1 January 2022).