Update: Samsung just released an update for there network tool, read more here.
I bought a Samsung Omnia 7 from TRE in Sweden, after unlocking the phone (Since I have a work phone I couldn’t switch to TRE) I couldn’t get MMS to work.
TRE had somehow locked the ability to change Network profile and the application supplied by Samsung didn’t do the trick.
Next Best Geek has finally found a solution, an application that can solve the problem (I have tested and it works).
However you’ll need a developer licence to be able to deploy the application.
Read more here
To install the application use “Application Deployment” (From the Windows Phone SDK) point to the file and deploy it to your phone.