Access current cell information of a mobile phone?

Access current cell information of a mobile phone?
I want to build a new system of tracking a mobile device just by getting the information of its current location. At any time , the working mobile will fall into a cell(cellular system) . The cell info display sometimes shows which geographic area are we currently in. So, i think its the same details that enables the service providers to achieve this. I want to know how to get the details in my application program.
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