Iran Visa is divided into 3 groups according to how it is presented to the citizens of other countries;
Group 1: Citizens of these countries can enter the borders of Iran with only their passport, no visa
required.
China, Turkey, Syria, Lebanon, Republic of Azerbaijan, Georgia, Bolivia and Egypt. 
Group 2: Citizens of these countries must proceed the visa application within 2 months prior to the trip.
Colombia, Somalia, England, Canada, America, Bangladesh, Jordan, Iraq and Pakistan Citizens of these countries must keep in touch with us trough Contact section of Piranoos.com for visa applications.

Group 3: Citizens of the other countries that are not mentioned above, can easily enter international
airports (preferably IKIA) holding their passport and the Piranoos reservation paper (printed) to get their
Visa. (The print will be checked by the passport police, over a phone call with Piranoos)

Important note: There will be no entry stamp or any sign of entering Iran in the passports of citizens.