How does the Singapore e-Visa work for Iranians?

Singapore issues visas electronically, so an Iranian applicant ends up with an e-Visa to print and carry beside the passport. Nothing is stamped in ahead of arrival. That's the standard process, and an unmarked passport is not a sign that anything went wrong.

Keep it as a printout and as a phone photo both, so a missing page or a flat battery never stalls the check on arrival. The e-Visa shows the travel window you were approved for; book your flights to fall within it.

An approved e-Visa carries you to a Singapore checkpoint but does not guarantee entry. An ICA officer makes that decision in person, the same way for every visitor whatever passport they hold.