A lack of access to repair or fix power outages on the south coast may see customers without phone coverage overnight.
"Many of our sites are on redundancy power to keep some services active but when this fails or the batteries go flat,the services will go offline,"a Telstra spokesman said.
"Given the extent of fires across NSW,Victoria and SA,we are critically aware of the need to restore any loss of services as quickly as possible. Our crews work closely with emergency services to ensure our teams have access to areas of need as soon as they are deemed safe to enter,or under escort.
"We take our responsibility very seriously and treat areas that are impacted by natural disasters as a priority for restoration of services."
Telstra said that places such as Ulladulla,Batemans Bay,and Bawley Point were affected.
An updated statement from Optus said that customers on the south coast in Long Beach,Batemans Bay,Denhams Beach,Malua Bay,Moruya Wandera,Mossy Point,Broulee,Moruya North,Moruya Central,Kianga,Narooma,Bermagui,Tilba Tilba,Agledale,and Cobargo may be experiencing outages.
"Optus’ network operations team are working closely with the relevant emergency services to access mobile sites to restore services as a priority. There are widespread power outages across South Coast,"a spokeswoman said.
Vodafone said that a fault on a third-party cable and hazardous bush fire conditions along the coast has resulted in disruptions to 3G and 4G mobile voice and data service on all mobile networks.
"Vodafone customers between Batemans Bay and Bega may experience difficulty making and receiving calls,sending text messages or using mobile internet services,"a spokeswoman said.
"Technicians have been unable to gain access to fix the fault due to the hazardous conditions in the surrounding areas. We are working closely with local emergency service crews and other relevant authorities to have services restored as soon as it’s safe to do so."