Kogan Mobile announced an "exclusive free deal" for Kogan customers with Yatango, offering "unlimited" mobile service, 6GB data for 30 days.
The SIM-only mobile provider launched earlier this year runs on the Optus network.
Telstra began shifting Kogan users to a limited 7 Day Plan last week, after which their service is terminated.
Some Kogan Mobile customers had prepaid their cut price "unlimited" Kogan mobile service for up to a year.
Kogan's 'exclusive' Yatango deal offers "Unlimited Talk, Unlimited SMS and 6GB Data for a month."
Users can monitor usage during the trial, Yatango says it will help build a flexible month-to-month plan that's right for users and saves money.
"Up to 80% of Kogan customers WILL save money on Yatango based on their usage, " Andy Taylor CEO of Yatango, claims.
There no fees or commitment for those who take up the Yatango Sim-only plan. All Kogan Mobile customers have been sent a voucher code by email.
An Optus spokesperson told CN it has received a "positive" response to its special double-your-data offer to abandoned Kogan Mobile users, last week.