Schengen Visa Usage Rules in any: what actually matters to know
Short answer
A single-entry visa allows one entry into the Schengen Area, after which you may travel freely between member states as long as you do not exit the zone. You must ensure your longest stay occurs in the country that issued the visa and carry proof of accommodation and onward travel to satisfy border control.
From real experience
A single-entry Schengen visa allows one entry into the Schengen Area (which for air and sea borders now includes Bulgaria and Romania for Schengen visa holders).
Once an individual has entered this zone (e.g., Bulgaria), they can travel freely between any Schengen member states (such as Greece and Italy) without it being counted as a "second entry," as long as they do not exit the entire Schengen zone. The restriction of a single-entry visa applies only to the initial border crossing into the Schengen Area. Re-entry after exiting the entire zone with a single-entry visa is not permitted.
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When traveling within the Schengen Area, the country that issued the visa must be the country of the longest stay.
If the duration of stay in multiple countries is equal, entry should be through the visa-issuing country. Bus checks on borders, especially eastern ones, are common. Travelers should always carry proof of accommodation bookings and onward tickets. While some Western border checks might be less strict at night, it's not guaranteed.
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If you hold a Schengen visa issued by one Schengen country (e.g., Switzerland) and your first port of entry or primary destination is another Schengen country (e.g., Austria), you will generally be permitted entry as both countries are part of the Schengen Area.
The 'first country of entry' rule within Schengen is flexible as long as your overall travel plan aligns with the visa-issuing country being your main destination or first entry point. However, customs and border control will confirm the validity of your visa and purpose of travel.
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The 'DURATION OF STAY' on a Schengen visa indicates the maximum number of days an individual is permitted to stay in the Schengen area during the entire validity period of the visa.
If the visa is valid for 22 days but the duration of stay is 8 days, the traveler can only stay for a cumulative total of 8 days within that 22-day period, not 22 full days. It's crucial to adhere to the 'DURATION OF STAY' to avoid overstaying and potential future visa issues.
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When traveling in the Schengen area with a visa from a specific country (e.g., France), the longest duration of stay must be in the issuing country.
Travelers need return tickets, proof of accommodation, and European travel insurance. If departing from a different Schengen country than the one that issued the visa, it's advisable to check with the authorities for specific requirements regarding exit with a Type C visa.
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For Schengen visas, the rule of entering the country that issued the visa applies only to single-entry visas.
For double-entry and multiple-entry visas, this rule does not apply. The primary condition is that the purpose of the visit must be related to the country that issued the visa. Border guards' verbal statements, especially over the phone, should not be taken as definitive legal interpretation.