TeleNav Suscription and Trial?

Hello, so I just managed to use the Trial for TeleNav, the GPS program (I'm with T-Mobile) I had no clue that they were going to charge $9.99 a month for this service. However, it comes with a free 14 day trial. I was wondering if anyone knew whether this trial will automatically end itself and not charge me? Or will it end in 14 days and subscribe me so that I have to pay? I'm kind of annoyed with this because I know how T-Mobile does things like this. They do a trial and if you do not cancel they start charging you. I'm hoping this isnt the case. Thanks for the help