Are you here to get network lock code or phone(security) lock code? If you need to unlock your Nokia N73 from its security lock then use default codes like 0000 or 12345. If your want to unlock your Nokia N73 from its network lock then use unlock code to do so. Contact your service provider to get it. If they failed to provide the code you can get it from online providers itself. Get the code from the site Onlinegsmunlock.com ,and you can unlock it yourself using unlocking instructions which is given in the site itself.
This is copied directly from the manual - check out #5 at the bottom.
Hope it helps!
7.7 Security
The Security menu allows you to
secure the phone electronically.
1. Open the flip and press
[MENU]
2. Press Settings & Tools.
3. Press Phone Settings.
4. Press Security.
5. Enter the four-digit lock code.
The lock code is the last 4 digits
of your mobile phone number if
it is set. The lock code is the last
4 digits of your MEID if your
mobile phone number is not set.
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