Is there an app to get smartphone location data without internet connection?

Question

satellite navigation

Surely the technology for obtaining the coordinates of the location of a smartphone that is not connected to the Internet has already been implemented. I imagine it as follows: an SMS request is sent, the application processes it and sends back the location data. Ideally, the coordinate format should be recognized by a popular service such as Google Map. If anyone is aware of such an application/service, please submit it. Thank you!

Answer 1

Soft-GPS-tracker => soft-GPS-Server
Channels: SMS, TCP / IP
If you search, you should be.

Answer 2

Surely, the technology for obtaining the coordinates of the location of a smartphone that is not connected to the Internet has already been implemented.

Implemented, this is GPS, but not all smartphones support it at all, and GPS is not available everywhere, for example, it is not available in buildings, although mobile Internet is available there.
Therefore, these technologies are used in pairs, and only one is a dubious decision.