Optus has restored more than 50 per cent of sites that have been out due to flooding in the Central and South East areas of Queensland.

Yesterday the telco said mobile and fixed broadband services were now fully operational in Brisbane, following disruptions due to power outages.

Today Optus said while major population centres from Rockhampton to Gympie have 2G and 3G and fixed broadband services, the telco is still working to restore full mobile and fixed broadband services in Brisbane, which is still being impacted by power outages.

In Bundaberg, Maryborough and Rockhampton, Optus' mobile network is operational and being powered by generators.

2G and 3G mobile and fixed broadband services are still down in Laurieton, Camden Haven, Murwillumbah and Burringbar and one site is down in Byron Bay due to power outages.

Optus customers in regional Queensland and New South Wales are also experiencing patchy coverage due to power and transmission failures.

"Our focus is on re-establishing those sites that are not currently operating in flood affected areas in both Queensland and New South Wales," Sam Kennedy, director Optus Queensland, said in a statement.

"For those unable to connect to the Optus network, we have a number of initiatives in place. Optus consumer and small business customers impacted by the flood damage can divert their landlines to mobiles for free."

Yesterday Telstra began restoring emergency triple zero services to customers in flood-affected areas following repairs to a damaged redundant fibre cable near Harlin in Kingaroy.

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