Obama, Iran's Rouhani hold historic phone call

WASHINGTON/NEW YORK (Reuters) - President Barack Obama and new Iranian President Hassan Rouhani spoke by telephone on Friday, the highest-level contact between the two countries in three decades and a sign that they are serious about reaching a pact on Tehran's nuclear program.

The call is the culmination of a dramatic shift in tone between Iran and the United States, which cut diplomatic relations with Iran a year after the 1979 revolution that toppled U.S. ally Shah Mohammad Reza Pahlavi and led to the U.S. Embassy hostage crisis in Tehran.