mms trouble

i just got an unlocked samsung d807 on ebay. everything else is working good so far but the picture messages. i cannot send or receive messages. it says there is an error n the mms service is not right, something like that. i think it has something to do with that it is an unlocked cingular phone n i have a tmobile service provider. if someone could please hep me out that would b great THANK YOU

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try this and let us know if it works for you.
Can I Use t-zones® or T-MobileWeb If I Do Not Have a T-Mobile Phone?

i went to it and it did not have the phone that i had so i dont no if it will work i have a d807 and i bought it for someone else so i dont no if it has worked rite away. but thank you if this does not work and you have any other suggestions they would really help thank you