Picture message problems on Samsung Comeback

I bought a Comeback a while ago and unlocked it for use on the AT&T network, however I now have a problem:

Whenever I receive a picture message I cannot retrieve it. Nor can I send picture messages. When I try to receive or send one it says that data roaming must be enabled. When I've enabled data roaming and try to send or receive it gives me the following message: "retrieving/sending failed. Service unavailable"

My dad (who is more electronic savy than I) and I cannot figure it out, anyone else know how to fix my problem?

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i have the exact same problem. i cant even receive ring tones. i called att and they said its because its a T-Mobile phone. if you have an answer can you please email me at [email protected] please?

I do not have an answer. I can see where it being a T-Mobile phone would could mess it up.
I have just decided to find a new phone at a later date once this one gets really annoying.

If you are an at&t user make sure your data network is enabled

Type *#87667# into your keypad

Scroll to MMS hit options button and select edit

In "set name" type:
AT&T MMS

Access name:
Wap.cingular

Auth type:
None

Protocol:
HTTP

Home URL
tp://mmsc.cingular.com

Proxy address
66.209.11.32

Port
80

Linger time (sec)
300

If you Change these settings you can at least receive picture messages I and should be able to send them as well. If you Change the browser settings to this as well you can use the internet. Hope this helps. If you have at&t it will say data charges may apply when retrieving messages hit yes and u do not get charged since their texting plans include picture messages.