My 8900 curve hangs after unlock code?

Hi all
I bought a blackberry curve 8900 second hand from a market thinking all I had to do was unlock the network and my sim card would work in it.
However when I enter my chosen sim a message comes up saying 'invalid sim' and at the startup page it reads 'the current sim card requires an unlock code do you want to unlock it now' I went to a shop to get this phone unlocked and the code used came up with the message 'code accepted' but afterwards the phone freezes (still displaying everything that was on the screen before) and the only thing I can do is a battery pull and this leaves me back at step 1
Sim lock I believe is t mobile uk (due to settings and startup logo being t mobile)
Do you know what could be the cause of this fault? I know it is not a software fault as I had a shop re install the software and the phone still freezes after the code has been 'accepted'
The phone us functioning in every way, I can use everything just not text, make calls (basically anything requiring a sim) even a tmobile sim comes up with 'invalid sim' and I an worried I have gone and bought a paperweight
Regards

I may have misunderstood, but it seems like you are talking about 2 types of "unlocking" here. You mentioned that you forgot your password, I'm assuming this is the lock password that you personally set on your BB lock screen to prevent unauthorized access? If so, I'm not aware of any way to retrieve that lost password.
You also mentioned using your BB on a different carrier. That type of "unlocking" is network unlocking. To use your BB with a different carrier, you need an unlock code for that. You can unlock your BlackBerry here. Since you only have a few attempts left, my suggestion is to use the Checkout by MEP method which always generates the single 100% correct unlock code.
To checkout with this method, you'll need to obtain your BlackBerry's MEP number (note that this is different from the MEP unlock code) which you can get from either here or here.
Alternatively, you can just order your code using the Country/Network your Blackberry is CURRENTLY locked to as well as the model of your BlackBerry.
Good luck, let me know if you need help.
EDIT: Links removed. Please review User Guidelines under section "No spam please."

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Message Edited by JSanders on 04-06-2009 03:50 PM
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My 8900 curve hangs after unlock code?

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