More than 1200 homes and businesses in the Ceduna and Thevenard area have less than a month to get connected to the National Broadband Network (NBN) before the existing system is turned off.
The transition to the NBN, which was switched on in Ceduna and Thevenard in November 2017, will be completed on May 10 for people within the fixed line zone.
On that day, existing landline phone and internet services will be turned off and replaced by services over the NBN access network.
Those who are yet to switch to NBN are being encouraged to contact a service provider to place an order as soon as possible to be able to continue using their landline phone and internet services.
Head of NBN Local for South Australia Tim Saul said this was the final stage of the transition and would bring the community closer to embracing the benefits of fast broadband.
"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," he said.
"If you have any special equipment that operate on your current landline, it's important you talk with your phone and internet service provider to get the right support when moving across.
"You should also visit the NBN Co website to register devices such as medical alarms and lift phones, and find out more about business devices and services."
Mr Saul said it was important for anybody with a medical alarm, auto-dialler or emergency call button to register the devices on NBN's Medical Alarm.
The majority of business services and devices that operate on existing landline phone and internet services also need to be migrated to the new network.
Residents and business owners can speak to service providers about plans and data usage needs, plus any special equipment operating on their current system such as EFTPOS and security alarms.
For other West Coast residents and businesses who have access only to the fixed wireless or Sky Muster services, the copper system will not be switched off.
In towns such as Streaky Bay and Wudinna where the current service will be retained, Mr Saul said people were choosing to keep their existing services for emergency communications.
For more information about the changes and whether it affects your home or business, check your address at www.nbn.com.au.