Summary
Roaming is when your Australian mobile phone connects to a foreign network overseas and your Australian provider continues to bill you — you keep your Australian number, and calls, texts and data work as normal, but at a higher daily rate — Australia’s three major carriers (Telstra, Optus and Vodafone) all offer roaming day passes starting at $5-$10 per day depending on your plan and destination; without a day pass activated, your phone can rack up charges on a pay-as-you-go basis that can run into hundreds of dollars per day
Australians spend approximately $1.4 billion on international roaming charges every year — YouGov Galaxy research commissioned by Vodafone found that 5 million Australians had been hit with international roaming fees, with the average charge coming to $290 per person; 250,000 travellers paid more than $1,000 in roaming charges; in one case, an Australian traveller returned home to a phone bill of more than $7,000; 63% of smartphone users are concerned about bill shock, and 1.5 million have taken the extreme step of leaving their phone at home entirely when they travel
Roaming is not your only option — and for most trips it is not the cheapest — the three main ways to use your phone overseas are a carrier roaming day pass, a local SIM card purchased at your destination, or a travel eSIM (a digital SIM loaded onto your phone before departure); for trips of more than a week, a local SIM or eSIM typically works out significantly cheaper than a daily roaming pass; the right choice depends on your destination, trip length and how much data you need
What is roaming?
International roaming is the service that lets your Australian mobile phone work on a foreign mobile network when you travel overseas. Instead of connecting to Telstra, Optus or Vodafone’s Australian towers, your phone connects to a local carrier’s towers in the country you are visiting — and that local carrier bills your Australian provider, who then bills you.
From your perspective, the experience is largely seamless: you keep your Australian phone number, you can make and receive calls, send texts and use mobile data, and the same SIM and handset work exactly as they do at home. The difference is the price.
How it works step by step:
- You land overseas and your phone searches for a local mobile network
- It finds a carrier that has a roaming agreement with your Australian provider
- Your phone connects automatically — unless you have disabled data roaming
- Any calls, texts or data you use are billed by the local carrier to your Australian provider
- Your Australian provider bills those charges to you — either as a day pass or at pay-as-you-go rates
The key risk: Your phone can connect to a roaming network and start accumulating charges the moment you turn it on abroad — or even during a transit layover — before you have made any deliberate choice about how to connect. Turning off data roaming before you board is the single most important step for avoiding unexpected charges.
Roaming vs data roaming — what is the difference?
Roaming refers to using any mobile service (calls, SMS, data) on a foreign network.
Data roaming refers specifically to using mobile data (internet) on a foreign network — the most expensive component of roaming for most travellers.
You can enable or disable data roaming independently of your ability to make calls and receive texts. Most travel advisories recommend turning data roaming off and using Wi-Fi for data, while keeping calls and SMS available.
The true cost of roaming — what Australians pay
International roaming has a well-documented history of generating “bill shock” for Australian travellers.
YouGov Galaxy research:
- Australians spend approximately $1.4 billion on international roaming charges annually
- 5 million Australians have been hit with roaming fees
- Average charge: $290 per person
- 250,000 travellers paid more than $1,000 in roaming charges
- One traveller returned home to a bill of more than $7,000
- 63% of smartphone users are concerned about bill shock before travelling
- 1.5 million smartphone owners leave their phone at home when they travel overseas
- 41% restrict their phone to Wi-Fi only to avoid roaming charges
The charges accumulate faster than most travellers expect — particularly through background data usage. Apps updating, email syncing, maps loading and notifications arriving all consume data silently, even when you are not actively using your phone.
How Australian carriers price roaming in 2026
Australia’s three major carriers — Telstra, Optus and Vodafone — all offer day-pass roaming products. The pricing and inclusions differ significantly.
Telstra International Day Pass
| Zone 1 | Zone 2 | |
|---|---|---|
| Price | $5/day | $10/day |
| Data | 2GB/day | 2GB/day |
| Calls and SMS | Unlimited | Unlimited |
| Countries | NZ and select Pacific | Most of Europe, Asia, Americas, 80+ countries |
| Activation | Via My Telstra app |
2GB/day applies to Telstra Upfront plans (current postpaid). Non-Upfront postpaid plans may receive a different data allowance — check your plan in the My Telstra app before travelling.
Key details:
- Zone 1 at $5/day covers New Zealand and a small number of Pacific destinations — Europe, Asia and the US are all Zone 2 at $10/day
- Day Pass resets at midnight AEST (Australian Eastern Standard Time) — not midnight at your destination; if you are in Europe and it is 11am local time, your daily pass has already reset in Australia
- Available on select Telstra Upfront postpaid plans; prepaid customers use separate roaming packs
- Broadest country coverage of the three carriers
Optus International Roaming
| $5 Add-on | $10 Pass | |
|---|---|---|
| Price | $5/day | $10/day |
| Data | 5GB/day | 1GB/24 hours |
| Calls and SMS | Unlimited | Unlimited |
| Plans | Choice Plus plans | Select other postpaid plans |
| Activation | Via My Optus app | Via My Optus app |
Key details:
- The $5/day add-on is only available on Optus Choice Plus plan tiers — check your plan eligibility before assuming you qualify
- The $5/day add-on gives a generous 5GB/day allowance
- Zone 1 countries only for the $5 tier
Vodafone $5 Roaming
| Detail | |
|---|---|
| Price | $5/day |
| Data | Your home plan’s data inclusions |
| Calls and SMS | Unlimited |
| Countries | 100+ destinations |
| Plans | Eligible Vodafone Infinite, Plus and Infinite Data plans |
| Cap | 90 days per calendar year |
Key details:
- Vodafone’s headline advantage: you use your existing home data allowance overseas rather than a separate daily allocation
- Speed-capped data tiers from your home plan do not count toward roaming data
- The 90-day annual cap means extended travellers and long-stay migrants cannot rely on Vodafone $5 Roaming indefinitely
- Generally considered the best day-pass roaming deal for eligible Vodafone customers
Quick comparison
| Carrier | Best-case daily price | Coverage |
|---|---|---|
| Vodafone | $5/day | 100+ countries |
| Optus | $5/day (Choice Plus) | Zone 1 |
| Telstra | $5/day (Zone 1) / $10/day (Zone 2) | 80+ countries |
How to turn roaming on and off
iPhone
Settings → Mobile → Mobile Data Options → Data Roaming (toggle on/off)
Or for dual-SIM: Settings → Mobile → [your SIM] → Mobile Data Options → Data Roaming
Android (Samsung)
Settings → Connections → Mobile Networks → Data Roaming (toggle on/off)
Android (Google Pixel)
Settings → Network and Internet → SIMs → [your SIM] → Roaming
Important: Turn data roaming off before you board your flight — not when you land. Some travellers find their phone connects to a foreign network during the flight’s approach and arrival before they have had a chance to act.
Alternatives to roaming — which is best for you?
Roaming day passes are the most convenient option but not always the cheapest. For trips longer than a week, alternatives typically save money.
Option 1 — Carrier roaming day pass
Best for: Short trips of 1-5 days; business travel; travellers who need to keep their Australian number active for calls
Cost: $5-$10/day depending on carrier and destination
Pros: Keep your Australian number; no setup required; works immediately on arrival
Cons: Can be expensive on longer trips; daily cost continues even on days you use very little data; resets at Australian midnight which wastes your daily allowance
Option 2 — Local SIM card
Best for: Longer stays (1 week+); budget travellers; destinations with cheap local prepaid SIMs (Thailand, India, Vietnam, the Philippines, Indonesia)
Cost: Varies by destination — often AUD $5-$20 for 7-30 days with several gigabytes of data
Pros: Cheapest data option in most Asian and Pacific destinations; high-speed local network access; often includes local calls
Cons: You get a new local phone number; your Australian number is unreachable for calls (though WhatsApp, iMessage and FaceTime still work via data); requires buying and inserting a SIM on arrival; not all phones are unlocked
Where to buy: Airport SIM card counters on arrival; convenience stores (7-Eleven in Thailand and the Philippines); authorised carrier stores
Option 3 — Travel eSIM
Best for: Most travellers — combines convenience of roaming with better pricing; compatible unlocked phones
Cost: Varies by destination and data allowance — typically AUD $10-$30 for 5-15GB over 7-30 days
Pros: Load before departure from home; no physical SIM swap; keep your Australian number active on your physical SIM while using eSIM for data; works immediately on arrival; competitive pricing vs carrier day passes
Cons: Requires a compatible unlocked phone (most modern iPhones and Android phones support eSIM); your phone must be unlocked
Set up before you leave: eSIM apps like Airalo, Holafly and Simcorner offer destination-specific data plans — purchase and install at home on Wi-Fi before you travel; install and activate before departure
The cost comparison — a worked example
10-day trip to Europe (one person):
| Option | Cost | Notes |
|---|---|---|
| Telstra Day Pass (Zone 2) | $100 | $10 × 10 days |
| Optus $5 Roaming | Not available | Zone 1 only |
| Vodafone $5 Roaming | $50 | $5 × 10 days (if on eligible plan) |
| Travel eSIM (10GB, 30 days) | ~$25-$35 | Airalo/Holafly approximate |
| Local SIM (Europe) | ~$20-$30 | EU roaming included across EU |
14-day trip to Thailand (one person):
| Option | Cost | Notes |
|---|---|---|
| Telstra Day Pass | $140 | $10 × 14 days (Zone 2) |
| Vodafone $5 Roaming | $70 | $5 × 14 days |
| AIS/DTAC local SIM (Thailand) | ~$10-$15 | 15-30GB, 30 days |
| Travel eSIM (Thailand) | ~$15-$20 | 10-15GB, 15 days |
Tips for avoiding bill shock
Turn data roaming off before you board. Do it before you leave home, not when you land.
Use Wi-Fi calling and messaging. WhatsApp, iMessage, FaceTime and Google Meet all work on Wi-Fi without any roaming charges. Connect to hotel or café Wi-Fi on arrival for messaging.
Download offline maps before you go. Google Maps allows you to download entire city or country maps for offline use — eliminating the need for data just for navigation.
Disable background app refresh. Settings → General → Background App Refresh (iPhone) — prevents apps from downloading updates while you are not using them.
Set a data usage limit. Both iPhone and Android allow you to set a data usage warning or hard cap — useful if you do have roaming enabled.
Check your plan before you go. Not all Telstra, Optus or Vodafone plans include the day-pass roaming deals — confirm your eligibility in your carrier’s app before departure.
Watch out for transit roaming. If your flight transits through a foreign country, your phone may connect to a local network during the layover. Keep data roaming off throughout any transit.
FAQs (frequently asked questions)
What is roaming on a mobile phone?
Roaming is when your Australian mobile phone connects to a foreign mobile network overseas, allowing you to make calls, send texts and use data — billed by your Australian carrier at international rates.
How much does roaming cost in Australia?
Australia’s three major carriers charge $5-$10 per day for roaming day passes. Without a day pass, pay-as-you-go roaming rates can be significantly higher. Vodafone charges $5/day across 100+ countries; Telstra charges $5/day for Zone 1 (NZ and Pacific) and $10/day for Zone 2 (Europe, Asia, Americas).
How do I turn off roaming on my phone?
iPhone: Settings → Mobile → Mobile Data Options → turn off Data Roaming. Android: Settings → Connections → Mobile Networks → turn off Data Roaming. Do this before boarding your flight.
Is roaming the cheapest way to use my phone overseas?
For trips of 1-3 days, a carrier day pass is usually most convenient. For longer trips, a local SIM or travel eSIM is typically significantly cheaper — particularly in Asia and the Pacific.
What is a travel eSIM?
A digital SIM that can be loaded onto your phone before departure via an app (Airalo, Holafly, Simcorner). Gives you data at competitive rates without a physical SIM swap. Available for most modern unlocked smartphones.
Can I still receive WhatsApp messages if I turn off roaming?
Yes — as long as you have Wi-Fi access. WhatsApp, iMessage, FaceTime and most messaging apps work on Wi-Fi without any mobile data or roaming.
What is bill shock?
The surprise of an unexpectedly large mobile phone bill after returning from overseas travel — typically caused by unintended data roaming charges.
Related guides
- Best eSIMs for international travel from Australia 2026 →
- Best eSIMs for international travel from New Zealand 2026 →
- Best travel money cards in Australia 2026 →
- Thailand travel guide 2026 →
- Singapore travel guide 2026 →
Carrier pricing, plan eligibility and country coverage are subject to change — verify current rates in your carrier’s app or website before travelling. Last updated October 2026.
Sources: amta.org.au — International roaming explained (Australian Mobile Telecommunications Association, official) | channelnews.com.au — International roaming costs $1.4bn: YouGov Galaxy | mozo.com.au — International data roaming packs: Telstra vs Optus vs Vodafone | whistleout.com.au — Pay as you go roaming Australia 2026 | shopback.com.au — Optus vs Telstra vs Vodafone Roaming: Australia 2026 | selectra.com.au — Using your Australian phone overseas | recharge.com — Data roaming: an Aussie’s guide to avoiding bill shock | simcorner.com — What is roaming guide | pointsbrotherhood.com — 2026 Aussie roaming fees compared
