Over the coming week, old heritage networks around Junee will be switched off, as the final phase of the national broadband network (NBN) continues its roll out across the region.

Up to 1,552 households around the town have already made the transition to NBN services, leaving still many who have not migrated away from the now-defunct landline and internet services.

Homes and businesses that fail to make the transition by next week may no longer have access to internet and landline service.

A spokesperson for the network explained that the functionality may go beyond just the service connection.

Many security systems, medical devices, and business EFTPOS machines may cease to work come next week when the old networks are switched off.

"It's particularly important for anyone with a medical alarm, auto-dialler or emergency call button to register these devices on NBN Co's Medical Alarm," said Amber Dornbusch, head of NBN Local in NSW and ACT.

"Some devices may not be compatible with the NBN access network so if you or a loved one has a medical device, speak to the device provider and your phone and internet provider as soon as possible to seek further guidance."

Since the roll out of the new network began in the Riverina three years ago, households and businesses have been given ample opportunity and notification of the need to update their systems.

A spokesperson for the NBN said that up to eight reminder cards have been posted to individual households reminding of the cut off.

"While many homes and businesses in Junee have already made the switch to a service over the NBN access network, this is the final stage of the transition," Ms Dornbusch said.

"If you're not yet connected to a service over the NBN access network, you'll need to contact your preferred phone and internet provider to place an order."

Nan Bosler, president of the Australian Seniors Computer Clubs Association has also reminded the community that even if you have never had a connection to the internet at your house, you may still need to make inquiries.

"Many older Australians are not aware the roll-out of the NBN access network will impact their unmonitored medical alarms," Ms Bosler said.

"There are easy step-by-step directions on the NBN website that will enable you to register for additional support in order to ensure a smooth migration to the network."

To make inquiries ahead of the switch off, contact the NBN free-call hotline on 1800 687 626.