Cell phone service appears to have been cut in Iran's capital after a disputed election that the government said President Mahmoud Ahmadinejad won.
There was no immediate comment from Iran's Telecommunications Ministry. But when users tried to call cell phones, a message appeared on their phones saying "error in connection."
It did not appear that cell phones were down throughout the country late Saturday. Residents in several provinces say their service is working.
Iran has already blocked the use of text messages and most Web sites affiliated with Ahmadinejad's top opponent, Mir Hossein Mousavi, were blocked. Other Web sites including Facebook were not accessible but it was unclear if they were blocked.