MMS now working on Solavei.

How does it work when you create a 2nd APN because you can only tick one setting when your finished
 
I'm guessing based on experience, so this could be wrong... I believe that radio button is only associated with the default "type". If you don't list default in your types then you don't get that button. Other types seem to work regardless of the button. When I first set up my phone I didn't delete the original T-Mobile APN I just deselected it. The MMS setting in it was enough to stop my MMS from working. My MMS would work after fully deleting the T-Mobile APN or after removing the mms type from the T-Mobile APN. If present it interfered even when its radio button wasn't selected.

Sent from my Nexus 4 on Solavei
 
After reading a suggestion on another forum I deleted the APN's I had created and used the default T-Mobile APN. No issues since then.