Just now backside itchy go and input this

"17. Can't send sms (Maxis)?

» Click to show Spoiler - click again to hide... «Some iPhones can automatically configure the sms center from the sim and some iPhones can't.
Key the numbers in the dialpad: *5005*7672*+60120000015#
This number is to key in the sms center number in your iPhone (credit frozzbyte)"

now i cant sent out sms

tried inputing *5005*7672*+60193900000# and *5005*7672*+6596197777# also cannot....so how ah? sent back to singtel? or do a rollback on itunes?

iPhone Generation : 3g
Locked/Unlocked (or Part Number) : unlocked
Current Firmware : 3.0 (7A341)
iTunes Version : 8.2
Computer Platform : MB500ZA