Phonelocator lets you register multiple devices to one account. This means a family could choose to share a single account so that they are able to see the location of all family members.
Similar services, such as Nokia Sports Tracker or Find-on-a-Map, are available, but Phonelocator does have some unique features (e.g. multiple map types) and takes a more focused, minimalist approach. Moreover it is also in active development and the developer is very keen to receive feedback and feature suggestions.
The Phonelocator software and service is currently available for free and should work with all S60 3rd Edition phones.
The on phone software is relatively simple but has some very useful settings which help
reduce the impact of battery life and data usage.
This is the 'My Phones' page where you can see the last updated location for all the phones
that are associated with your account.
This maps shows the current location of one of the phones I am tracking.
Example of route recorded using Phonelocator. You can choose to display the route / location on a
number of different maps types including Google Map, Satellite, Aerial Photography and Terrain.