But in a country where people live on roughly $2 a day (http://www.guardian.co.uk/world/2001/sep/25/afghanistan.terr...) I doubt many have $1,400 satellite phones that cost $6 a day to use.
Other methods are impossible...
Twitter is blocked through regular internet (see Michael C. McHugh comment here: http://www.politico.com/blogs/bensmith/0609/The_stakes_in_Ir... )
Cell phone towers are what's been cut so no SMS (http://www.google.com/hostednews/afp/article/ALeqM5jSPlmVgh-...)
Satellite dishes have been banned since '94 (http://ipsnews.net/news.asp?idnews=34407) so no highspeed internet that way.