pager that accepts short text messages (max 140chars) (exact same limit as SMS?)
Coverage can be variable enough that most buildings that focus on in-building paging (e.g. an ALF) rely on having their own Pager Transmitter. This means (a) you can't page a staff person off-campus, and (b) you often can't page a person in the building from outside (e.g. via SMTP)!
And you never get a failure message in any of these cases.
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