Australians using certain Samsung phones have been told to urgently update or replace their devices because they may not be able to make triple zero calls.

Telstra issued a statement this afternoon, warning that dozens of older Samsung models are not properly connecting to a back-up network in order to contact emergency services.

If a customer is unable to get phone service with their telco, the device is meant to automatically connect to one of the other networks in order to be able to make triple-zero calls.

See the full list of devices that need to be replaced in the table below. 

However, Tesltra said it had identified an issue where the impacted devices aren't properly connecting to the Vodafone network when the other networks are unavailable, leaving them unable to make an

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