Net Monitor Mode for the Nokia 9110
Here is some information about enabling the net monitor mode on the Nokia 9110. This information was e-mailed to be by Michal Jerz (mjerz@ats.pl). You might be able to use this method on a 51XX or a 61XX too.
Here is the circuit diagram of the cable you will need to make to connect the 9110 to your PC.

Here is the pin out for the 9110 so you can connect the M2BUS end of the cable to the 9110.
Pin 5 is GROUND
Pin 8 is M2BUS
Here Is the shareware program you will need to run on your PC to enable the menu once you have built the cable.
Here are some pics of the 9110 with the menu enabled.

GOOD LUCK!
(c) Tim Merrell 1999-2005. http://www.mrvfone.com.au
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