i'm using 3gs singapore set, officially unlocked. upgraded to 3.1.2 firmware, initially couldn't send mms also (the mms option in the photo folder and camera icon in sms was gone). upon checking the modem firmware oredi upgraded to 05.11.07, and carrier also changed to Carrier 5.0 (i'm using celcom). so, be it i think.

jailbreak it with blackra1n, successful in single attempt. it's all good, at that time i realized my carrier logo was still showing 'MY CELCOM', so i decided to update it by the usual way (hold shift while pressing update in itunes while choosing the old ipcc file provided in the carrier logo thread - this old ipcc file i saved it in my desktop, but i noticed there is a new version of ipcc file provided in the carrier logo/bundle topic+thread).

to my surprise, the mms option in the photo folder is there, and the camera icon in the sms write new also got. when i checked in my setting, the carrier shows Celcom 4.0, while my modem firmware still intact at 05.11.07. tried sending few mms, with no hassle it really works. even the mms settings also has been filled up (before was totally blank).

IMHO, the trick here is to update the carrier logo (or carrier bundle?) using the old ipcc file, after you have restored to 3.1.2 firmware.

hopefully this can help to others out there who has this mms disability with other telco problem.

i have yet to try tethering function though - scared it will disappear if i activate it, LOL.

u won't find that option if you have Carrier 5.0 in your carrier setting.

sorry, i mean for for Celcom user.

but some maxis user also encounter this ehh?