ref
https://www.welivesecurity.com/2020/07/14/welcome-chat-secure-messaging-app-nothing-further-truth/

Functionality	Source	Age (years)
Call recording	open source, GitHub	8
https://github.com/hunterli/callrec/tree/master/src/com/cn6000/callrec

SMS stealing	open source, GitHub	6
https://github.com/tuenti/SmsRadar/tree/master/library/src/main/java/com/tuenti/smsradar

Google Maps coordinates	open source, Blogspot (plus other sources)	5
https://msql-php.blogspot.com/2015/11/google-map-v3-get-city-state-zipcode.html

GEO tracking	open source, GitHub	8
https://github.com/Artsu/GeoTrack/tree/master/src/fi/jyu/ties425/geotrack/util

GPS tracking	open source, GitHub	5
https://gist.github.com/ertugrulozcan/70973144b1c582618a6c