Optus has followed Vodafone's lead in attempting to stamp out massive global roaming charges.
The telco announced plans on Wednesday to essentially cap roaming charges at $10 a day.
From mid-November, customers on lock-in Optus plans will have the option of a daily $10 "travel pack" allowing unlimited texts, calls, and 30MB of data.
It will be available in "zone one" areas such as the UK, Europe, North America, Asia and New Zealand, but not in the "zone two" countries of Latin America, Africa, and the Middle East.
Vicki Brady, managing director of customer relations at Optus, said the plan will cover 94 per cent of the countries to which customers travel.
The initiative is a response to a growing backlash against exorbitant global roaming fees.
Optus' own research found more than half of customers who had used global roaming reported a bad experience, and a third returned to bills of more than $1000.
Brady said customers had been living "in fear of huge bills".
The move comes three weeks after rival Vodafone announced a plan to charge customers an optional $5 daily fee to use their regular text, data, and call allowance overseas.
The plan is available only to customers who sign up to new plans expected to be announced before the end of the month.
Vodafone's plan is available in the UK, US and New Zealand, but the company said it intends to expand it to more countries by the end of the year.
Asher Moses, a spokesman for the Australian Communications Consumer Action Network (ACCAN), welcomed moves to end "the global roaming rip-off".
He said charges have been too high for too long, and "do not come close to reflecting the true cost of providing the service".
Optus' and Vodafone's offerings will be "significantly cheaper" than current arrangements, but buying a local SIM card is still likely to be cheaper, he said.
Telstra has not revealed any plans to alter its global roaming charges.
A spokesman said the telco offered several pre-paid international data packs.
He also pointed to SMS alerts that warn travelling customers each time they use 20MB of data.
