Add Yahoo as a preferred source to see more of our stories on Google. Imagine receiving an alert on your phone from a government agency at night, warning you about an alien attack, when you have ...

The Indian government's emergency mobile alert system, known as the Cell Broadcast Service (CBS), may temporarily stop sending alerts to users as authorities review its performance and effectiveness.

ReadyWake targeted more than 108,000 contacts after Cary's water-main break, but thousands were unreachable and some missed the warning.

The alert took many by surprise when it was sent to millions of phones on Friday night - but it may have also put vulnerable people at risk.