Your communicator/panel’s IMEI address is how you are registered with Alarm.com. Only ONE dealer at a time can be registered with your IMEI address. Unless your previous dealer has released your IMEI address we will not be able to get you online. If shown registered just call your previous dealer and ask them to release your IMEI address so another dealer such as SafeHomeCentral.com can get you registered with Alarm.com.
In the US only 4G LTE cellular communicators can be registered. Canada still allows 3G (GSM and CDMA) for now.