I purchased a home with an existing alarm system. The issue was no master code to make any changes and I was not certain the alarm was any good. I was recommended to contact Bob at Safe-Guard Alarm Systems in Scarborough (Ph# 416-282-0796). They came in and spent a good amount of time going through the system, testing, re-configuring programming to get it going and trained me on how to use. I called them back and had them put in a internet module and Ethernet cable so I could connect our smart phones to monitor and arm/disarm. It turned out to be a job I could not handle myself and I am usually pretty technical. It is a small family run business that is customer oriented and I highly recommended. Give them a try if you are looking for honest and knowledgeable alarm company. They also offer monitored service very cheap. I opted to start with self monitor by adding the smart phone module. Hope you found this helpful!