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by ignoramous 2561 days ago
At AWS, it isn't uncommon to get paged via email, SMS, phone-call, and a smartphone app in addition to having an actual paging device (usually a dumb phone) separate from one's personal phone or laptop to avoid cases where the personal phone and email are both down (I believe this has happened, and not just once) and that someone important is out of reach in a time of dire need.

Source: ex-AWS.