Iran blocked Telegram,

> the most popular messaging app in the country, early May, claiming the service used by 40 million Iranians endangers national security. Telegram is widely used in Iran, for activities as varied as chatting, booking appointments at beauty salons, selling cars or finding partners. Even the supreme leader, Ayatollah Ali Khamenei, had his own channel until recently. Iran’s judiciary issued a decree ordering internet service providers to block access to the Telegram app, as they have already been doing for years for Facebook and Twitter. Many people manage to bypass the state’s firewalls by using virtual private networks(vpns). But such software requires a lot of bandwidth, and they often significantly slow internet access.