Most phones are very stable. When they de-register, its an event worth knowing about. So, in theory the email alerts are a perfect way of being able to be proactive. Alas, however, when a mobile agent de-registers and re-registers, we also get messages - every time the phone comes and goes from coverage. So, registration alerts are no longer useful. If would be nice to be able to filter or isolate these events out from the wired-phone events.