MMS question, free or not? read body before answering please

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http://forums.androidcentral.com – i'm on tmobile. i have 1000 minutes talk, UNLIMITED text, but NO data plan. if i send multimedia messages (MMS). do i get charged for data? people told me you either need wifi or data on in order to send mms. however, they also said that the MMS uses a different server from internet data. so if i send MMS, would i still get charged for data plan since it requires, even though i have unlimited text plan? (HowTos)