The phones of select people will start blasting out loud siren sounds on Tuesday afternoon.
The government is forging ahead with its first test of a national emergency alarm system between 1pm and 2pm.
Chosen people in East Suffolk will discover their phones or tablets are emitting a "loud siren-like sound".
Rest assured, it is only a test and requires no response.
Once the system is up and running it will send alerts to people in areas where there is a risk to life, such as during flood or terror attack.
Emergency alert systems are common in many countries, including the USA, Netherlands, Canada, South Korea, Japan and New Zealand.
The UK has never had such a system however, despite trials in the early 2010s.
As a result, during the early phase of the coronavirus pandemic the government had to rely on the four major mobile operators to send text messages to their customers.
In the future it will be able to directly contact people for both national and local alerts.
This technology also means no personal details, such as phone numbers, are shared and ensures there is no significant strain added to the phone networks.
"The Emergency Alerts service will be a vital tool in helping us to better respond to emergencies, both nationally and locally,” declared Penny Mourdant, the Paymaster general.
“The concept was used to good effect during the pandemic when we asked people, via text message, to stay at home to protect the NHS and save lives.
"This new system builds on that capability and will allow us to more quickly and effectively get life-saving messages to people across the UK.”
