Can't get my iPhone back on...

Hi —
I'm trying to find out what happens when an iPhone is disconnected from it's mobile operator's network, when a contract is terminated or the number is ported across to another phone. I have a company iPhone which I need to give back as I'm leaving the job. Before I gave it back, I wanted to sync it so I could delete all the music, photos and apps from it.
Unfortunately when I was trying to sync, iTunes seemed to hang for ages with a spinning beach ball. So I force quit iTunes but it happened again, so I force quit again and then unplugged my iPhone. It wouldn't respond so I tried to restart it. Now all I get is the silver Apple logo on a black background for about a minute, then the screen goes black. What I want to know is this a problem with the phone because of the iTunes crash or is it because the phone has been disconnected from the mobile operator?
Any help appreciated. Thanks.

Apologies for not searching the Apple support site properly first. Seemed I had to restore the phone from scratch which I'm doing now. Hopefully this will resolve the issue before I hand it back!

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