TELSTRA is reminding customers across Australia to be wary of scammers who attempt to obtain their personal information via telephone.
In the past 12 months, the number of comments from customers to Telstra about telephone scams has increased four-fold.
In most cases, customers are called at home and told they need to pay for technical support to fix a problem that doesn't exist on their home computer.
Telstra spokesman Peter Jamieson said the criminals operating these scams were trying to sell customers fake software updates or trick them into disclosing their personal details over the telephone so those details could then be used illegally.
"The increasing number of these telephone scams is concerning and customers should be alert to any attempts to trick them into disclosing their credit card or banking details over the telephone," he said.
Tips to avoid phone scams include making sure your computer is protected with regularly updated anti-virus software, never give an unsolicited caller remote access to your computer and if you think something's not quite right, just hang up.