Mobile Telecommunication Company of Iran (Persian: شرکت ارتباطات سیار ایران‎), commonly abbreviated as MCI and also known under its brand name Hamrahe Aval (Persian: همراه اول‎; the first companion), is the first and largest mobile operator in Iran.[1] MCI is a subsidiary of the Telecommunication Company of Iran and has approximately 17 million postpaid and 49 million prepaid subscribers.[2] Hamrahe Aval's service is available in 1,239 cities and over 70,000 kilometers of highway in Iran.