Go to Menu > Settings > About phone > System Software Updates and click Check Now at the bottom.
If it's available, this should prompt the download. You can also try turning your phone off and on and switching between 2g/3g. We did this on my mate's O2 phone when he didn't do the update the first time it appeared.
Go to Menu > Settings > About phone > System Software Updates and click Check Now at the bottom.
If it's available, this should prompt the download. You can also try turning your phone off and on and switching between 2g/3g. We did this on my mate's O2 phone when he didn't do the update the first time it appeared.