Coffs Harbour residents could lose their landline phone and internet service later this year, if they have not yet switched over to the NBN.

Phone and internet services provided on the copper network will be progressively switched off from July, with homes and businesses forced onto the National Broadband Network.

Most of Coffs Harbour, Sawtell and Toormina will have lost the copper service by next January.

NBNCo Spokesman Darren Rudd said those already on the NBN will not notice the change.

"We are not pulling the copper out, or touching properties, but we are switching the copper signal off," he said.

Mr Rudd said the change will affect all homes in the area with a landline phone, including those that are not using computers or the internet at all.

"Even if they have voice-only - that is they don't have a computer operating at home - they still need to switch over to the NBN network, to make sure they can still use their landline phone," he said.

"People will have to have an order in their system before the cut-off dates, and the cut-off dates are coming up a lot faster for Coffs Harbour than Sawtell or Toormina."

"Coffs Harbour is within the next six months, and Sawtell and Toormina are a bit further off."