Looking for free/shareware PDA and Cell Phone Tracking Database

[Dbase beginner]

Hi,

I have a list of 500 PDA users, spread over 7 offices.
I want to keep an eye on what happens with the devices and their SIM-cards. As they are often swapped between offices and SIM-cards get lost.
I am pretty sure that I don't have to re-invent the wheel.
Do you have any idea of a free/shareware tracking tool for PDA's and cell phones ?

Thanks in advance !

 

[reclusivemonkey]

I've no experience of using this at all and it may be overkill, but for what its worth;

http://sourceforge.net/projects/irm

Its classed as "Production/Stable", so it should be OK. Sourceforge is all OpenSource, but its platform independent as far as I can see.