Service manual

The radio telephone’s identity information is held by its lcal GSM system in its Home
Location Register (HLR) and Visitor Location Register (VLR). The VLR contains
identity informatino on all local active radio telephones. Should you roam to another
area, system or country the radiotelephones identity information is sent to the VLR in
the new system. The new system will then check the radio telephones details with
your home system for authenticity. If everything is in order it will be possible to
initiate and receive calls whilst in the new area.