Open the browser in your mobile phone and go to mobil.sl.se. Choose "English" and you will get access to the Journey planner, realtime information and zone search - all in English.
If the mobile version doesn't give you the answer to your questions, you will find the telephone number to our Customer Services. (Which is +46 8 600 10 00, by the way.)
Mobil.sl.se is the perfect travel companion when visiting Stockholm.