[imnuts]

At that registry key, there should be several keys (3 of them) that give you size limit options. They should be DWORD values for 'Wap1SendLimit1', 'Wap1SnedLimit2', and 'Wap1SendLimit3'. Just so you know though, carriers will probably not allow a 7MB MMS message through. Your phone may send it, but I think the biggest you'll likely be able to send successfully is probably 5MB, probably less though.