1) TrackOne is the Android App.
2) By using this app to track incoming and outgoing calls of others.
3) Install this app into others mobile.
4) Register your number and others name into this app.
5) Then after you got messages when others got incoming calls or other make outgoing calls (in message you got incoming and outgoing calls number of others)
Note: This is a paid app and this app is not available in playstore. anyone interest for this app send me your information to below details.