MTN engaged Hoffmann in February 2012 in a bid to resolve the dispute with Turkcell outside the court. Turkcell refused to cooperate with the Hoffmann's investigations.
The allegations still cloud MTN's reputation, according to some industry watchers.
"The fact that Turkcell has withdrawn the case does not clear MTN of the wrongdoing in the manner it acquired the license in Iran," said Edith Mwale, a telecom analyst at the African Center for ICT development told Computerworld Zambia.
She pointed out that Turkcell only withdrew the matter from a U.S. court on a technicality.
Sign up for CIO Asia eNewsletters.