i have a question about jamster!

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Iam doing an offer site like notebooks4free.com, or a gpt site and i do offers for free and get money and i was wondering if you can randomly out of no where subscibe to jamster for 9.99 and then cancel like 30 minutes (orless) later if you dont want it no more o are you charged AFTER the month the 9.99 or are you charged AUTOMATICALLY AS SOON AS YOU SUBMIT YOUR PIN/? BECAUSE I SUSCRIBED AND DID NOT DOWNLOAD A thing! I DIDN'T DOWNLOAD NO RINGTONE, I just entered my number got the text then submit please others have told me , to do jamster offers because they are free just submit your number get the pin, then text STOP right after!