@Crap
Looks like an older phone.
There was a recent announcement about MMS messaging:
https://productioncommunity.publicmobile.ca/t5/Announcements/Picture-and-Group-Messaging-End-Date-Fe...
You could try setting your APN settings to following:
New Settings:
APN: sp.mb.com
MMSC: http://aliasredirect.net/proxy/mb/mmsc
MMSC proxy: mmscproxy.mobility.ca
MMS port: 8799
MCC: 302
MNC: 220
APN Type: default,supl,mms
or default,mms,agps,supl,fota,hipri
