need some help

[CSVT]

I recently bought one of these phones and i unlocked it myself it was locked to rogers (canada) and i am on the bell network i chamged all the apn setting using the settings directly from the bell site for this phone the problem is i cant send mms i cam receive np but can not send all data functions work i called bell tech support and they said it should work fine. I have a data plan with unlmtd mms so i dont know what to do i emailed lg but no reply hopefully some here can help