Is working for a telecommunications and satellite channels company—some of which are decent and some indecent—and (a company that produces) international calling cards, cards for downloading movies and clips from the internet, and internet cards, permissible or forbidden?

There is no harm in working for the company by selling permissible services and avoiding the sale of services for forbidden channels. It is obligatory to avoid dealing with customers who are known to intend to use the cards for forbidden matters, as Allah Almighty says: (And do not cooperate in sin and aggression). So, if you avoid, in your work, anything related to channels that broadcast evil, then there is no harm upon you in working for the company in what is permissible, such as services for news channels and international calling cards.