Understanding Cell Broadcast: What It Is and How to Enable Emergency Alerts on iPhone and Android

Cell Broadcast Emergency Alerts Notification Recently, or Cell Broadcast Services (CBS) sent a traffic closure notification to the public regarding repairs to the Purple Line underground tunnel on Prachathipok Road on 9 July 2026.

Rapid information awareness is the key to safety. Cell Broadcast (pronounced “Cell Broadcast”) has become a widely discussed emergency alert system because it can instantly send messages to people via their mobile phones. Many have seen alert messages pop up on their screens but may not understand how the system works. Thairath Online will help you get to know it better.

Getting to know “Cell Broadcast” — what kind of alert system is it?

Cell Broadcast, or Cell Broadcast Services, is a system that sends emergency alert messages from government agencies directly to mobile phones in targeted areas immediately. Its key feature is that it does not require phone numbers, app installation, or internet connection, relying solely on mobile network signals.

When a message is sent, the system displays an alert with a sound on the phone screen, even if the phone is locked. Cell Broadcast alerts are usually used for important cases such as:

• Natural disasters like floods, earthquakes, and storms.
• Evacuation orders or urgent government warnings.
• Road repairs or closures affecting public traffic.
• National emergency alert system tests.
• Safety-related emergencies.

How to enable Cell Broadcast emergency alerts on iPhone and Android devices.

To enable emergency alerts on mobile phones with iOS (iPhone)and Android,the menu options may vary slightly depending on the phone model and brand. It is recommended to update the operating system to the latest version (Android 11 or iOS 18 or later) to fully support government alerts. . How to enable Cell Broadcast alerts on iPhone:

1. Go to Settings.

2. Select Notifications.
3. Scroll to the bottom to find Emergency Alerts (TH-ALERT).
4. Turn on Emergency Alert or all relevant alert types.
How to enable Cell Broadcast alerts on Android:

1. Go to Settings. 2. Select Security & Emergency.

3. Enter Wireless Emergency Alerts.
4. Enable all alert types, such as severe alerts, earthquake alerts, and test alerts.
Clarifying why some phones do not show Cell Broadcast emergency alerts.
Checking and enabling these settings in advance helps reduce the chance of missing important alerts. However, some may wonder why they did not receive a Cell Broadcast alert even when one was sent. Common reasons include:

Emergency alerts are turned off on the phone.

The operating system does not support or is not updated to the latest version.

• The phone is outside the coverage area for the alert message.
• The phone is turned off or has no network signal at that time.
• Cell Broadcast alert on 9 July 2026.
• The Cell Broadcast alert sent on 9 July 2026 automatically delivered the following message to citizens’ phones:

DDPM announces traffic closure 09-07-2026

16:58:04 Authorities are currently inspecting Prachathipok Road to facilitate urgent repairs to the Purple Line underground tunnel. Therefore, Prachathipok Road will be closed from Ban Khaek Intersection to Wongwian Yai in all directions, and from Wongwian Yai to Ban Khaek Intersection in all directions, starting from 17:30 onwards. DDPM

At that time, supported phones (Android 11 or iOS 18 or later) received the same alert message.

The use of Cell Broadcast for alert messaging marks a significant advancement in the country’s emergency alert system, enabling fast, accurate, and widespread communication to the public.

Summary

Cell Broadcast Service is an emergency alert system that helps people receive urgent information quickly and comprehensively. Enabling alert notifications in advance on your mobile device is a simple way to enhance your safety and that of those around you. When fully operational, a brief alert message could greatly reduce potential harm.