At 12:00 noon on May 10th, all Singtel users in Singapore will experience a sudden 10-second ringing and vibration on their mobile phones. This is the "SG Alert" emergency alarm system that the Singapore Civil Defence Force is implementing in phases—the alarm will still sound even if the silent or do not disturb mode is enabled.

At 12:00 noon on May 10th, all Singtel users in Singapore will experience a sudden 10-second ringing and vibration on their mobile phones. This is the "SG Alert" emergency alarm system that the Singapore Civil Defence Force is implementing in phases—the alarm will still sound even if the silent or do not disturb mode is enabled.

Phones connected to the Singtel network will receive the test alert on Sunday, including those without an internet connection.

Phones connected to the Singtel network will receive the test alert on Sunday, including those without an internet connection.

Phones connected to the Singtel network will receive the test alert on Sunday, including those without an internet connection.

Phones connected to the Singtel network will receive the test alert on Sunday, including those without an internet connection.