GSM based Tracking

Hi Everyone,

I am developing Geo-Tracking application. I am tracking device based on different methods like:

Tracking based on IP address, Wi-Fi, GPS, GSM

I want to implement tracking based on GSM. I am using VC++.

Please suggest me any third party library available or windows API, using which I can implement my Geo-Tracking based on GSM.

Thanks in Advance,

Nilesh