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NBN services require a backup battery unit to keep power going to your NBN Network Termination Device in the event of a power outage so that some elements of your telephone service can continue to operate for an estimated period of time of about 5 hours during the power outage. TPG NBN service does not include the supply of a backup battery unit. This means during a power outage, you will not be able to make or receive any calls, including calls to emergency services. Please ensure that you have an alternative method to make calls such as a mobile phone.