The provider is the fourth largest operator in the country, with 1.2 million customers and a number of contract-free plans.
amaysim’s chief commercial officer, Isaac Ward, said: “For over a decade our customers have been at the heart of everything that we do at amaysim.
"We’re proud to offer large data allowance, more value and more of what our customers want and need.
“We’d love to offer a massive thank you to Canstar Blue and an even bigger thank you to our amazing customers!”
Optus completed its acquisition of amaysim in February this year.