Bloomberg | Golnar Motevalli: Donald Trump�s phone rings in the middle of the night. �It�s the Iranians,� he says, jolting upright in bed in his underwear.

But it isn�t Tehran on the other end of the line, only a salesman shilling hair-loss treatments.

This scene, conjured by an Iranian animator after the U.S. president urged the Islamic Republic to��call me,��has gone viral, capturing the derision many Iranians feel for the U.S. president who�s trying to bring their country to heel. It�s one of a string of jabs at Trump that have swept Farsi social media since he made that unrequited offer to an Iran that�s refused to bow to his scaled-up sanctions and displays of military force.

Prank callers have telephoned the Swiss Embassy in Tehran, after CNN reported the White House passed a phone number Iran could use to officials in Switzerland, which has represented U.S. interests in Iran since the 1979 Islamic Revolution. Another wag counseled delicacy.

�In my opinion Trump should�ve also given the Telegram I.D. for the White House,� a user named Kev tweeted, referring to the messaging application used by tens of millions of Iranians.��It�s the very start of a relationship and Iran might feel awkward calling straight away.�

Others posted an image of Iranian President Hassan Rouhani holding a phone receiver to his ear, dialing a U.S. phone number and saying the dial code out loud. One Twitter user wondered who�d pay for the call, considering the strains on Iran�s economy. Another mused what might have happened if Trump�s tenure had coincided with the term of Iran�s former hardline president, Mahmoud Ahmadinejad.

�Why weren�t these two in office at the same time??,� the person said. �The two of them would�ve made a brilliant pair!�