Unlimited texting includes instant messaging?

I have T-Mobile.
My mom signed up for unlimited texting.
Since I have unlimited text messaging, does that also count for unlimited instant messaging?

EX:
Signing on AIM from my phone (mobile AIM), will I get charged/will my mom have to pay for me signing on AIM or any other instant messaging service?

Thanks.

No it doesn’t because instant messaging is a data service

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2 Responses to Unlimited texting includes instant messaging?

  1. Diane T says:

    No it doesn’t because instant messaging is a data service
    References :

  2. Anna K. says:

    If you have unlimited to people outside of Tmobile, then you won’t have to pay extra. but if you only have unlimited for Tmobile users, then you will.
    References :