IPhone 3G post O2 unlock activation

Hi there,
I bought my mates iPhone 3G off him last week to use with a new Tesco SIM only deal I have just got. However, the iPhone was locked to O2 so I went through the necessary steps with O2 to officially unlock the iPhone. Since it was my mates old contract phone he rang up O2 for the unlock and I asked if it was O.K to connect the iPhone to my iTunes when the unlock came through and I was told this is fine.
My mate got the text today telling him to connect the iPhone to iTunes and sync as normal which I did. At first nothing, so I reconnected the iPhone and it came up with a message saying "There is no SIM card installed in the iPhone you are attempting to active" even though my Tesco SIM card is in the iPhone. I've tried restoring the phone, but now I don't even get the activation message. Sorry about the long read... please help!
EDIT: I also now have on 1 bar of signal, where as before the unlock attempt it said "No service". Tried ringing someone but I get an instant failed call.
Thankyou,
Ally
Message was edited by: Ally464

I think what it means is, after unlocking you should swap the O2 SIM for a non-O2 SIM and then sync as normal... At least that's what I did when I got mine unlocked.
One of the O2 iPhone FAQs says:
+We may not be able to unlock your iPhone for a variety of reasons. Here's a few common ones:+
+• We can't locate your iPhone on the O2 network. This may happen if you haven't 'synced' your iPhone with iTunes.+

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