In a correspondance with the SEC in 2009, Deutsche Telekom disclosed few details regarding their investments in Iran.
"We have bilateral agreements with operators in Iran that provide for termination of traffic into the country and traffic originating from the country. We have roaming agreements with network operators in Iran. Roaming agreements allow our mobile customers to make and receive voice calls, send and receive data, or access other services when traveling outside the geographical coverage area of the home network, by means of using another operator’s network." (CORRESP for DEUTSCHE TELEKOM AG, 11/27/2009)