Cell Broadcast is a built-in public warning system used in countries such as the UK, the Netherlands, and Spain to send emergency alerts directly to mobile phones in a defined area, without requiring an app or internet connection. It works through mobile network towers, delivering location-based messages instantly to all compatible devices in range. Supported by global guidance bodies such as GSMA, it is recognised as a highly inclusive and reliable model for public warning. In RISE, it serves as a strong example for other countries seeking accessible, trusted, and timely crisis communication.