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The last known location of your mobile telephone is updated in many different ways when it interacts with the mobile network such as making or receiving a call or text message.
If the mobile telephone has not interacted with the mobile network it will automatically update its location around every 60 minutes. A mobile telephone's screen shows the network carrier's name and coverage bars when active.
Mobile telephones switched off or without coverage will not have their location updated and therefore will not be identified to be issued a warning message.