I am a non-EU citizen and am a PhD student in the Czech Republic. When I had my visa of type D, it says valid for CZ not Schengen States.
That being stated, I can understand that I can only enter EU from the Czech Republic. However, will I be able to travel across Schengen States using my student visa? I know that there is no passport control while visiting an EU country, but if the police of that country requires an ID:
- Is my student ID card OK? Or should I show my passport?
- Can the visa in the passport cause trouble like I visited the country illegally?