Help! cant text w/unlocked ATT Tilt

I bought an unlocked Tilt and have Tmobile sim card. I need to know how to change the settings to enable me to text using my Tmobile sim card. I tried to add a new connection for MMS settings but it wont recognize mine and always defaults to the ATT MMS settings. Any ideas?

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MMS is not texting. Texting works as soon as you insert the SIM card into a phone with the appropriate frequencies.

Replace the AT&T settings with the ones at these links:

MMS
https://support.t-mobile.com/knowbas...ture_Messaging

WAP
t-zones® and T-MobileWeb Settings For Non-T-Mobile Branded Phones