Australian Roaming Charges in Asia Telstra, Optus, and Vodafone

Telstra charges A$10 per day in Indonesia including Bali via the International Day Pass. The charge activates the first time your phone does anything — a message, a map load, a background notification. A 10-day Bali trip costs A$100 in Telstra daily pass charges. A Telkomsel eSIM for the same 10 days costs A$12-20 with full 4G LTE speed and no daily billing.

Yes. Optus charges A$10 per day in Thailand via the Optus Travel Pass. The charge activates automatically on first phone use in Thailand. A$10/day gives you access to your domestic Optus plan data allowance on DTAC and True Move H networks. Without the Travel Pass, Optus applies per-megabyte rates that can reach A$3/MB or higher. A 7-day Thai eSIM from Airalo or Nomad costs A$10-18 for 5-10GB of True Move H data.

For most popular Asian destinations, yes. Telstra's International Day Pass and Optus's Travel Pass both apply A$10/day across Indonesia, Thailand, Japan, Singapore, Vietnam, South Korea, Malaysia, Philippines, and Hong Kong. Some Vodafone AU plans charge less — A$5/day for selected Asian destinations under certain plan tiers. The A$10 rate is standard and applies regardless of how much data you actually use on a given day.

Yes. Regional Asia eSIM plans cover multiple countries under one data allowance. Airalo's Asialink regional eSIM covers 24 Asian countries including Japan, South Korea, Indonesia, Thailand, Singapore, Malaysia, Vietnam, and the Philippines. You buy one plan and it works across all covered countries with no country-switching steps. Prices start at A$18-25 for 5-10GB valid for 30 days. This is cheaper than Telstra or Optus daily charges for any trip of two or more countries.

Most Japan eSIM plans from Airalo and Nomad connect to NTT Docomo or Softbank, Japan's two largest networks. NTT Docomo covers 99.9% of Japan's population including rural mountain areas and island ferry routes. 5G is available in major city centers on NTT Docomo and Softbank networks. Telstra roams in Japan via NTT Docomo — the same towers your eSIM connects to, at a fraction of the cost.

On the fast boat between Bali and Lombok, your phone stays connected to Indonesian terrestrial towers for most of the crossing. Indonesian Telkomsel coverage extends across the Lombok Strait so your A$10 Telstra Day Pass continues to apply during the ferry. On longer open-ocean crossings, such as between Indonesian islands farther from shore, your phone may lose cellular signal entirely and maritime rates may apply. Check your signal before using data on any ferry.

Singapore's MRT has full 4G and 5G coverage underground, including all interchange stations. If you are using a Telstra or Optus roaming pass, your A$10/day charge applies as soon as your phone connects at Changi Airport and continues throughout your trip. There is no way to avoid the daily charge while keeping roaming enabled. The most effective approach is to disable data roaming on your Australian SIM before landing and use a Singapore eSIM — a 7-day 5GB plan costs A$8-12.

No. None of the three major Australian carriers — Telstra, Optus, and Vodafone AU — include free Asia roaming on any standard consumer plan. Some premium enterprise plans and select reseller plans include a number of free roaming days per year, but these are exceptions. For free or very low-cost Asia data, the only practical option is a destination or regional eSIM from providers such as Airalo, Nomad, or Holafly.