Can you get to web sites with your browser?
Have a look at your APN settings and compare to these.
Name: whatever you want
APN: sp.mb.com
MMSC: http://aliasredirect.net/proxy/mb/mmsc
MMS proxy: mmscproxy.mobility.ca
MMS port: 8799
APN type: default,mms,dun
APN enable/disable: APN enabled - probably on anyway and greyed out
MVNO type: GID
MVNO value: 4D
Save, then select to use, then go in and out of airplane mode
