Lumia 1020 SIM unlock code no longer accepted afte...

I am the original owner of an AT&T Lumia 1020. At some point AT&T sent me a SIM unlock code on my request, which allowed me to use a T-Mobile SIM without any problems. After a few months I sent this 1020 to a Nokia repair center for warranty service because of unstable reception. I received the repaired phone, and the reception seems to have been fixed. But..
After receipt I found that the phone had been re-locked to AT&T. The IMEI shows up as being the same as before (makes sense), but the old unlock code no longer works. Contacting Nokia at the time they told me, sorry, talk to AT&T. Unfortunately AT&T sent me the exact same unlock code as they had given me before (also makes sense, it's the same phone), but it doesn't take.
My questions;
- am I making some kind of obvious newbie mistake?
- can a repair or component replacemetn change some info in the hardware that prevents unlock?
- will unlock services find the same non-working unlock code if I try to have them unlock it?
Thanks for any help!

I see. Thanks for sharing your experience, Joe1020. Have you coordinated this with your network provider to see if they can provide you another code? Let us know how it goes.

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22-Mar-2008 06:10 PM
bikemagic wrote:
Who has the code Nokia or Orange? And how long should it take?
It is the network's responsibility to provide its users with SIM-unlock codes.
As for how long it takes, if you're still within the period when you have to pay them to unlock the phone then I don't know. If you've had it for long enough for the operation to be free then they should be able to give you the unlock code over the phone. I've had 5 phones unlocked that way and I've always been given the codes over the phone.
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