Help Not detecting System Updates

[Elit3]

Hey guys, I bought a nexus s outright on Saturday, (Tuesday today) and put in my plan sim card which is with Vodafone Australia. The problem is that when I check for system updates it says 'Your system is currently up to date.' when i know it isn't, it is only on 2.3.3 and i can't update to even 2.3.4, how do i fix this

 

[megadude]

had the same problem and found a solution here:
androidforums.com/nexus-s/493615-how-switch-2-3-3-2-34-a.html

 

[Elit3]

For anyone wonder (I got a new phone sgs3) vodafone AU had not published the update yet and i manually updated to 4.0.3 and afew weeks later 4.0.4 was release and i got an OTA for that