Sending SMS on my iPhone with Vodafone sim is now working. Maybe the steps I'd mentioned and followed yesterday did it for me. It's kinda a day delayed but it doesn't matter now. The importang thing is I now can send sms.

Just follow the steps on this thread and wait...
http://www.hackint0sh.org/forum/f204/77272.htm

About the 3.0 update, I did not advised it for every_mother's in order to send sms. Every_mother's mentioned about text forwarding which is not possible in old firmwares but it is now in 3.0 firmware.