Do you have to pay for IM on T-Mobile's service?

So My mom has me on family plan.She has a phone and so do I from T-Mobile.My mom got the Family Talk plan which is $99.99 each month.I have a Gravity T phone.I used IM which is like....Yahoo!,MSN,AIM,and etc.I used Yahoo! for about 5-6 minutes.I used it by 3g and I was at Wal-Mart. P.S.I got the phone at Radio Shack.
 
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