Suppose an EU citizen is resident of another member state and gets issued a national identity card identical to the ones citizens get there. (If that is not concrete enough to answer the question, assume a Finnish citizen who is a temporary resident in Estonia.)
This is an Estonian ID card issued to a Finnish citizen. The ones for Estonian citizens look exactly the same, just with a different entry at "citizenship" and without a small remark on the back side specifying the type of residence. I know that this is the old model that isn't valid anymore but I couldn't find an example of the new card.
If one carries no other identity document into a country which is neither the issuer nor the country of citizenship,
- Is it possible to cross the border from outside the EU?
- Is it allowed to cross Schengen borders?
- Does this satisfy the requirements to carry an ID imposed by some member states, e.g. Portugal?
- Is it possible to get on board of an airplane in countries where a valid ID is required for this, e.g. Spain?
In short, can such a card be used just as if it had been issued to a citizen?
I know that technically you can enter the EU even without any identification at all as an EU citizen but that comes with a lot of hassle. I'm interested in how well this works in practice. Is such an identity card assumed a valid document that is waved through?
PRADO lists such a card as an identity document but not a travel document. Which consequences does this have for the holder?