NEED HELP!! UNLOCKED HTC DASH 3G (t-mobile) with AT&T

I recently purchased a unlocked t-mobile HTC Dash 3G to use with AT&T...I can receive call and send text but can't not received or send MMS (picture messaging) or access the internet not in less it's a WiFi connection. Does anyone know if i need to change settings on my phone to make this possible...???

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Hey How are you doing ? I was wondering if you had every fixed your problem with the MMS setting ? I have the same problem .
Thanks for and help you can give

That is exactly the same thing going on with this phone,after seeing two other threads makes a guy think it is just that type of phone