My IMEI is made up by a lot of 00000, but...

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Hi,
seems like I've just noticed this issue, even if my last flashing (no, I didn't use that Odin option to clear efs) has been done 7 months ago.
The (italian) guide I have read when I bought the Spica back in June didn't mention ANYTHING regarding backing up the efs folder.
My IMEI is 00000000000000, but I can succesfully make and receive calls, sms, and use HSDPA data (Postemobile, a virtual operator working on Vodafone network).
My efs folder contains only a nv_data file.
My doubts are:
-If my IMEI is blank, why I haven't any problem at all?
-If I flash with ODIN a stock 2.1 firmware, can I recover the issue?
-I asked a friend a good nv_data file from an eastern Europe Spica, in an extreme case may I overwrite my nv_data file?
-Any hints regarding the policy of the US carriers if the IMEI is blank? It would be a problem if I couldn't connect to the mobile network. Last time ATT and T-Mobile worked well, but that was before the last ROM flashing, so I don't know...

thanks

Your nv_data file did get corrupted or deleted. This could happen if you ticked the option "Debug Only" -> "Phone EFS Clear" option in Odin.

When the file is broken or missing a new file is created at startup which does not contain IMEI data. Look if you have a nv_data.bak file in your efs folder. You can rename it and look if it fixes the fault. If there is no such file then you have a problem. This can't be fixed easily.
You can go to a professional unlock shop nearby and get a emei repair.
Ore you can contact this guy and get a fix for 20$:
h t t p://forum.samdroid.net/f28/complete-imei-restore-how-1817/

PS: The missing imei will not cause problems with the phone. The complete phone will work without a problem.