When preparing for your journey, it is important to ensure that you have all the needed travel documents up to date and with you. You will be asked to prove your identity at various points during your journey. The travel documents you need depend on your nationality, destination and transit countries.
In case you have been issued with a digital travel document (held on your phone), it may not be sufficient for entering your destination country or for boarding your flight. Therefore, please always take also your physical travel document with you.
Due to a lack of interoperability between the systems used by the authorities of different countries, the immigration authority of your destination country may not be able to verify your digital travel document. Depending on your routing, the airline may be liable to verify that you hold the required travel documentation, and airlines are not able to verify digital travel documents at this stage. You will, therefore, need to bring along your physical passport or identity card (if the destination country allows entry on an identity card).