With the sheer volume of messages, SMS tend to be unobtrusive on phones today, and users also have a variety of ways to keep text messages at bay. However, this is not very suitable for a disaster warning, because as many people as possible should be informed quickly.
The CB reports therefore pop up as conspicuous messages on the mobile phone screen. At the same time, the reception triggers an alarm siren on the mobile phones. It starts regardless of the selected volume settings. So even if you have your phone on silent, you’ll still hear the alarm for the highest level alerts.