It may not support it. I have H2O wireless as a carrier and can't receive MMS messages. I can send them just fine.
The month that I was on Net10 AT&T Sim, confirmed that everything worked. MMS, SMS, H/H+/3G
I just can't use Net10 and safely port my existing number long story and has nothing to do with your topic.
I spent one weekend really trying every possible APN combination MMSC and proxy and same results, couldn't receive MMS. If I did receive MMS, it came from UNKNOWN Message not found.
Service works on T-Mobile MMS, Internet, (SMS can only send messages in 2G). But you need to keep it on EDGE for full compatibility.
NET10 APN
Name net10
APN tfdata
MMSC
http://mms-tf.net
MMS Proxy mms3.tracfone.com
MMS Port 80
These settings worked on my Lumia 928. But it was an AT&T sim, different MVNO like H2O just didn't work. I'm thinking AIO doesn't work either. But you need to play with settings and also helps if you install ACCESS POINT.
AOI Settings:
APN: ndo
Proxy: Not Set
Port: Not Set
Username: Not Set
Password: Not Set
Server: Not Set
MMSC:
http://mmsc.aiowireless.net
MMS Proxy: proxy.aiowireless.net
MMS Port: 80
MCC: 310
MNC: 150