i think i phone cannot send mms..
but may b u could if u used 3rd party appilcation..i read sumwhere before..but cannot remembered...
u can google it...
btw, u need to jailbreak ur i phone to install 3rd party application...
and of coz it is risky if u dun ve enuf xperience...
i also used i phone..n still learning to jailbreak mine..
lot of benefits if u can jailbreak it.