If you live in the USA and have any friends that work for Kone, and has a KST (Kone Service Tool) tool, Tech Support at Kone has developed a Sim Card Simulator. You plug in this device where where the Sim Card slot goes, run a program and the unit thinks there is a Sim Card installed until unit is powered down. Allows use of the KST tool on Schindler or use of CADI until controller is rebooted or powered down. Pretty slick device.