With the Digital Switchover all existing BT “copper” telephone lines are being removed. This will mean that all your emergency lift call systems and alarms that use a BT line will need upgrading. Below is an image that shows the typical layout and components used in a lift emergency call system. Using our Lift Saver 4G GSM unit you can simply replace the BT master socket with a SIM card based mobile solution and if desired, replace your existing autodialler.