Yes, Payconiq works with any mobile operator provided they have access to the internet. However, be aware of possible roaming charges billed by your foreign mobile operator, if applicable, knowing that given the maxima imposed by the European Commission for roaming costs, the cost in terms of associated data connection fees to a Payconiq payment made with your phone, with a subscription signed with a mobile operator licensed in one of the EU member countries, will be only a few cents maximum.