OPTUS will slash 750 jobs across Australia as part of a major restructure that will see areas of "duplication" within the telco culled.
Two thirds of the forced redundancies will happen in Sydney with the rest occurring across Queensland, Western Australia and the ACT.
A spokeswoman for Optus said all of the job cuts in Queensland would be at offices in Brisbane.
She said retail stores were safe as a majority of them were franchises.
A majority of the job cuts will be at senior and managerial levels as well as in the areas of operations, back office and support functions.
A minimal number of customer-facing staff would be affected by the redundancies, an Optus statement released on Wednesday read.
The telco will remove a number of duplicated areas to create a "streamlined and centralised structure".
A new marketing and sales branch will be created.
"The competitive environment requires Optus to have a sustainable cost structure to remain competitive and continue to deliver value to our customers," Consumer Australia chief executive officer Kevin Russell said.
"However a key drive of the restructure has been a desire to elevate the voice of our ten million customers to ensure they are heard loud and clear in every area of our business..."
The redundancies will cost Optus $37 million.