A handheld electronic device comprising: a substantially planar screen configured to display information to a user of the handheld electronic device; and a tilt sensor for use in determining the angle between the substantially planar screen and the horizontal, wherein the handheld electronic device is configured to: operate in a mode which displays information relating to various pre-defined users of other electronic devices on the substantially planar screen and which highlights one of the various pre-defined users for selection; select operation of a mapping mode when the handheld electronic device is tilted with the angle between the substantially planar screen and the horizontal is in a predefined range; and show the location of a plurality of the various pre-defined users of other electronic devices including the location of the electronic device of the highlighted pre-defined user of another electronic device on the substantially planar screen when operating in the mapping mode; wherein: the location of the other electronic devices which are not on the same map as the electronic device of the highlighted pre-defined user may be accessible by showing avatars representing respective other electronic devices at positions on the map which are in the direction of their locations, whereby a respective other electronic device can be selected and the map then scroll to the position of that respective other electronic device. a substantially planar screen configured to display information to a user of the handheld electronic device; and a tilt sensor for use in determining the angle between the substantially planar screen and the horizontal, wherein the handheld electronic device is configured to: operate in a mode which displays information relating to various pre-defined users of other electronic devices on the substantially planar screen and which highlights one of the various pre-defined users for selection; select operation of a mapping mode when the handheld electronic device is tilted with the angle between the substantially planar screen and the horizontal is in a predefined range; and show the location of a plurality of the various pre-defined users of other electronic devices including the location of the electronic device of the highlighted pre-defined user of another electronic device on the substantially planar screen when operating in the mapping mode; wherein: the location of the other electronic devices which are not on the same map as the electronic device of the highlighted pre-defined user may be accessible by showing avatars representing respective other electronic devices at positions on the map which are in the direction of their locations, whereby a respective other electronic device can be selected and the map then scroll to the position of that respective other electronic device. operate in a mode which displays information relating to various pre-defined users of other electronic devices on the substantially planar screen and which highlights one of the various pre-defined users for selection; select operation of a mapping mode when the handheld electronic device is tilted with the angle between the substantially planar screen and the horizontal is in a predefined range; and show the location of a plurality of the various pre-defined users of other electronic devices including the location of the electronic device of the highlighted pre-defined user of another electronic device on the substantially planar screen when operating in the mapping mode; wherein: the location of the other electronic devices which are not on the same map as the electronic device of the highlighted pre-defined user may be accessible by showing avatars representing respective other electronic devices at positions on the map which are in the direction of their locations, whereby a respective other electronic device can be selected and the map then scroll to the position of that respective other electronic device. the location of the other electronic devices which are not on the same map as the electronic device of the highlighted pre-defined user may be accessible by showing avatars representing respective other electronic devices at positions on the map which are in the direction of their locations, whereby a respective other electronic device can be selected and the map then scroll to the position of that respective other electronic device.