To check if Nokia had entered the codes you need:
1. USB cable
2. installed drivers for your model Nokia
3. downloaded program Nemesis

Run the program nemesis and press SCAN DEVICE



Next go to the "Security ".
Then click "Read " and shows us something like this:


As you can see in the picture we have 0 samples that is all OK.
After entering an incorrect code,
As you can see in the image below.

If it is in this box figure 3, this means that counter has been locked.
If we have blocked counter we need to enter code using USB cable
How to enter code to nokia using USB cable

On the basis of data we can also determine which network the phone works.
MCC+MNC it is numbers of operators network code.