Why am I not able to send or recieve mms messages on unlocked Samsung Galaxy Rugby Pro?

So I recently bought an unlocked samsung galaxy rugby pro. I have att as a provider and everything so far has worked fine, except mms messages. I can't really seem to send them with the default text app, and i definitely am not able to receive them I get a message telling me to download it, and after hitting the download button, it just has a loading bar and then doesn't do anything.

I've tried using chomp text app, but had issues with some friends not able to get my regular messages, and then when receiving mms messages I get the message unable to download, and then to check my apn settings.

I also decided to try textra, and for this app I am able to send texts no problem, but get no notification at all for mms messages.

Any solutions?

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