Question : retreiving GPS data fom a NON Gps phone

hello
I am working on an application to  retrieve GPS data from a non GPS phone, specially in India.

From the research I have done, below are the ways to get GPS data
a.> Adding a GPS receiver . This is way to expensive for me. So does not work for me
b.> Using Opencellid. I am not sure how good this is for India
c.> Using the cellid. However not sure if this is blocked by the network service providers
 
Your help would be really appreciated

Answer : retreiving GPS data fom a NON Gps phone

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