Iranian authorities have lifted the restrictions imposed on Telegram messenger amid protests which swept through the country, Sputnik reported citing local media.
The government also blocked some VPN privacy apps, which are commonly used to get around longstanding bans on sites such as Twitter, YouTube and Facebook.
"The information concerning the end of filtering on Telegram is correct", a spokesman for the telecoms ministry told AFP.
Several major cities in Iran, including Tehran, Mashhad, Isfahan and Rasht, have witnessed anti-government protests in recent weeks.
Clashes between anti-government protesters and security forces had left at least 20 people dead, while more than a thousand were arrested.
The government had accused the popular opposition news channel, Amadnews, of using the Telegram to incite "armed uprising and social unrests".
The head of the country's cybercrime committee, Abdolsamad Khoramabadi, had earlier criticised the government for not blocking Telegram sooner, and said officials should be "punished" if it was found they deliberately failed to act against online "trouble-makers and enemies".
Just three weeks before the unrest, on December 19, Rohani told the country's first conference on civil liberties: "We will not seek to filter social media".
Rohani said during the unrest that the restrictions were necessary, but should not be "indefinite".
"You want to take the opportunity to shut down this social media for eternity". But officials said hundreds of companies using the app for their marketing and sales had been hard-hit by the social media restrictions, and President Hassan Rouhani was quoted as saying about 100,000 people had lost their jobs.