How to get the value of latitude and longitude using IMEI

I just want to find the location of some users for whom IMEI id is already present in my sqlite database table.

On a click of a button,I just want to get the IMEI ids of all the users and then I want to get the value of latitude and longitude on the basis of IMEI id,so please help me how to write its code,please provide with some helpful links which i can include in my app.

Thanksss