i phone - checking if unlocked

MOPI

Hi I want to check if my i phone 3gs is unlocked.
I currently use the phone on Vodafeon and only have some old o2 sim cards, which I think are now inactive. Would the i phone boot up all the way to the home screen with an o2 sim in it if it was locked to Vodafone or would an error message be displayed?

Thanks in advance!

dduk

You can use the pretty much as normal with either no sim, or with the incorrect sim in a locked phone. The only way to tell is try some different sims and see if it connects to the network.