is there an app that'd allow me to locate someone if they don't have mobile data on (based only on their phone signal)?

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Android Localization Location SMS

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  • locatemydevice

    Application miming Google's Find My Device through SMS

    • In F-Droid there's at least two apps with this purpose, Locate My Device and FindMyDevice (discovered them in this thread). FindMyDevice appears to be the most extensive one, but I haven't tested either.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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