GPS Spy Plus

Continually tracks location of your or somebody else's phone. Shows last 24 hours of trace in 15 min increments.

Install, press "Activate Yours" and assign a key (any name you want  -- "my phone", or "Johnson", or the phone number) to the phone. Press "Refresh" to view its trace.

To view someone else's trace, press "Trace Another" and enter the key assigned to the app installed on another phone.

There are two options for the app on another phone: either another copy of the full featured GPS Spy Plus, or the free Tracker available from http://www.maxicom.net/gpsspy.