I spent few hours trying to get my cheap ebay Nokia LCD working, searching on sketch and wiring and even changing LCD without any success until I discovered that default contrast was too low to see anything. So changing the line
setContrast(40); // Good values range from 40-60
to
setContrast(60); // Good values range from 40-60

Did the trick, could be great to set default value to 60, il all case good to know....

I love nokia

A compile time error is showing up to me

In Nokia_LCD.cpp line 323: In member function 'bool Nokia_LCD::print(long unsigned int)'

variable-sized object 'number_as_string' may not be initialized

char number_as_string[length_as_string] = {0}; 

This solution has worked for me 💯

char number_as_string[length_as_string];
memset(  number_as_string, 0, length_as_string*sizeof(char) );

Thanks for the great tutorial! This was a lot of fun to get working!

I followed the tutorial's instructions and connected pin 6 to RST via a 10K resistor. However, with the 10K resistor there, the line didn't work for me at all. I reduced the value to 1K and it worked fine, but that's really just a random guess from me. It also worked without the resistor, but as stated in your tutorial, that can shorten the board life.