sprint blackberry curve plan question asappp!?

i just got my new blackberry curve 8530 today from sprint. i bought the simply everything plan too which supposedly means unlimited everything including data.

my main two questions are :
1. Does the unlimited cover the blackberry web for sure 100%?
2. does downloading the blackberry app world on my phone cost any money, like will it be on my bill or charge me for ANYTHING...? i know that if i buy an app it can cost, but will it cost justy to download the store? and will it prompt me before i purchase if it des cost?


please be AS DESCRIPTIVE AS YOU CAN!.

thanks soo muchooo!!!
such as if i want to use the myspace app that is already on my blackberry, will it cost me any money to use and/or like accept the terms &aggreement to down load it?

thanks again<3
 
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