Ihave a 2003 TD6, since not using the telephone for some months the service provider terminated the SIM card,I have now installed a new one and all I can get on the front screen is enter PIN No. No pin No was put on the card and it works OK in a normal cell phone,no pin required. I have tried another card with a pin No entered on it and entered the pin No as requested but still just get 'enter pin No' The phone suits my limited requirement so dont want to replace it. Can anyone sugest a solution.
Thanks for any help.

try 2121....

After you have tried 2121 try 0000.

If its the factory "siemens" phone kit with the sim card slot under the phone in the centre console then check to make sure your new sim is GSM as any other type wont work

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Thanks for the replies.

We dont have GSM in SA, and my previous MTN card worked fine until they decided I hadnt used itfor a period and canned it