Australia eSIM Guide: Optus, Telstra and Outback Coverage
Australia is roughly the size of the continental United States with a far smaller population, and most of it lives along the coast. In Sydney, Melbourne, Brisbane and Perth, any travel eSIM will work well. On the Great Ocean Road, in the Red Centre or along the drive north from Cairns, the network your plan uses decides how much of the trip you'll spend offline. Australia also has a rule about older phones that catches some visitors out.
Which networks Australia eSIMs use
Australia has three mobile networks: Telstra, Optus and TPG Telecom (which runs the Vodafone brand). Among the wholesale Australia plans we track:
| Plan type | Networks | Where data exits |
|---|---|---|
| Roaming, single network | Optus (5G) | Singapore |
Optus covers the cities, suburbs and main highways well. Telstra is generally regarded as having the widest coverage in regional and remote Australia, so if you're planning a long outback trip, check whether your plan includes Telstra, and compare each network's coverage map against your route. If it doesn't, expect more time without signal between towns and plan for it.
Coverage: cities, coast and outback
| Area | What to expect |
|---|---|
| Sydney, Melbourne, Brisbane, Perth, Adelaide | Strong 4G and 5G |
| Coastal highways (Pacific Highway, Great Ocean Road) | Mostly covered, with gaps in national parks and on headlands |
| Great Barrier Reef boat trips | Signal near the coast; none far offshore |
| Red Centre (Uluru, Kings Canyon, Alice Springs) | Coverage in towns and resorts; long gaps on the highways between them |
| Outback roads, Kimberley, Cape York | Very limited outside towns and roadhouses |
On remote drives, carry offline maps, plenty of water, and tell someone your route and expected arrival time. Satellite messaging on newer phones, or a hired satellite device, is worth considering for the most remote areas.
Older phones after the 3G shutdown
Australian networks have switched off 3G. As a result, phones need to support 4G calling, including emergency calls over 4G (VoLTE), to work properly. Some older phones, including some models bought overseas, have been blocked from Australian networks because they can't make emergency calls this way.
If your phone is more than a few years old, check before you travel. Australian carriers and the government publish guidance and IMEI check tools for this. Most phones from major brands released in recent years are fine. Our guide on checking whether your phone supports eSIM and is unlocked covers the other checks to do before you buy a plan.
Getting around
In Sydney, you can tap on and off trains, buses, ferries and light rail with a contactless bank card or phone wallet, without buying a travel card. Other cities have their own systems, and many are adding contactless payment. Ride-hailing apps such as Uber and DiDi operate in the major cities.
For road trips, the main use of your data is navigation and checking road conditions. State transport websites publish road closures, which matter during bushfire and flood seasons.
How much data you'll need
| Trip | Suggested data |
|---|---|
| A week in Sydney and Melbourne | 5 GB |
| 2-week road trip | 10 to 15 GB |
| Working holiday or a month or more | 20 GB or more, or a local SIM |
| Sharing with a travel partner | Add half again, or read our hotspot guide |
Free Wi-Fi is less universal than in some Asian cities. Hotels and cafes usually have it, but it can be slow in regional areas. The data guide has per-activity figures.
Working holidays and long stays
If you're staying for months on a working holiday visa, a local prepaid SIM or eSIM from an Australian carrier usually makes more sense. You get a local number for employers and banks, and access to a network of your choosing. A travel eSIM is handy for the first few days while you set that up. Keep your home number active for bank codes using our dual-SIM guide.
Setting up and troubleshooting
Install the eSIM at home over Wi-Fi, switch it on after landing, set it as your cellular data line and enable data roaming. If there's no service, toggle airplane mode, then try selecting Optus manually. If your phone won't connect to any network at all, the 3G issue above may be the cause. The troubleshooting guide covers the remaining steps.
Emergency calls
The emergency number in Australia is 000. 112 also works from mobile phones.
FAQ
Do Australia eSIMs include a local number?
Most travel eSIMs are data-only. Local carriers sell prepaid plans with an Australian number, which require ID.
Will my eSIM work at Uluru?
Around the Yulara resort area there is mobile coverage, but whether your plan's network reaches it, and the highways leading there, depends on the operator. Check the coverage map for the network your plan uses.
Why won't my older phone connect in Australia?
Since the 3G shutdown, some older phones that can't make emergency calls over 4G have been blocked. Check your model before you travel.
Is Telstra or Optus better for a road trip?
Telstra generally has wider regional coverage. Compare both coverage maps against your route.
Does my eSIM work in New Zealand too?
Only if the plan lists New Zealand. Some regional plans cover both countries; Australia-only plans don't.