Optus is the latest telecommunications giant to offer compensation to customers who have not received National Broadband Network (NBN) speeds they were promised.

Key points: Optus is offering compensation to NBN customers with slower than expected speeds

Optus is offering compensation to NBN customers with slower than expected speeds The telco said it will provide "appropriate remedies" to customers who were overcharged

The telco said it will provide "appropriate remedies" to customers who were overcharged Yesterday Telstra announcement it will refund 42,000 accounts where advertised speeds can't be met

The admission by Optus that some customers might have been overcharged follows yesterday's move by Telstra to refund around 42,000 accounts where advertised speeds could never be achieved.

An Optus spokeswoman confirmed the company is "working with the ACCC" and has responded with the regulator's requests for detailed information and data.

"We are examining the detail of the announcement by the ACCC, but can confirm that Optus is taking action to provide appropriate remedies to those customers where it has been confirmed that the underlying NBN service cannot deliver the speed they signed up for," the spokeswoman said in an emailed statement.

"Optus is considering a range of measures for customers depending on their individual circumstances."

Like Telstra, Optus has attributed the underlying source of undelivered speeds to NBN copper wire access — specifically for fibre-to-the-node (FTTN) and fibre-to-the-building (FTTB) connections — noting the ACCC has acknowledged the slow speeds.

TPG said in a statement it was considering the ACCC's stance and would be in discussions with the consumer watchdog "in the coming days".

Vocus, which owns brands Dodo and IPrimus, said it was also working with the ACCC and would compensate consumers who did not get the speeds they had been promised.

"Once we complete our review we will provide the necessary information to consumers, and will offer appropriate remedies for customers who are not capable of achieving the maximum attainable speed of their plan," a spokesman said.

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Concerns about the reliability of the NBN escalated yesterday when Telstra admitted it might have engaged in misleading or deceptive conduct and made false or misleading representations, in breach of Australian Consumer Law.

Over the last two years, Telstra mentioned in its NBN advertising it could provide download speeds of up to 100 megabits per second (Mbps), and maximum upload speeds of 40 Mbps.

After investigating this claim, the Australian Competition and Consumer Commission (ACCC) concluded many customers were not receiving the high speeds they had paid for.

The corporate regulator said these maximum speeds "could not be achieved in real-world conditions", due to the limitations of customers' fibre to the node (FTTN) and fibre to the building (FTTB) internet connections.

"Our investigation revealed many of Telstra's FTTN and FTTB customers could not receive the maximum speed of their plan," ACCC chairman Rod Sims told the ABC.

"Even worse, many of these customers could not receive the maximum speed of a lower-speed plan."