Optus roaming in Japan: what it costs, and when an eSIM is cheaper
With Optus, data in Japan costs A$5.00/day (Optus Daily Roaming), so A$35.00 for 7 days and 6 GB. An eSIM covering 7 days and 6 GB costs from $12.99 (GoMoWorld).
The best eSIMs in Japan for a week
For 7 days and 6 GB
- 1Best unlimited
PlanJapan
Japan specialistUnlimited · 7 days
$33.00$4.71 per day- No daily cap announced
- Network: NTT Docomo
- Hotspot up to 10 GB a day
- 2Cheapest
GoMoWorld
14 GB · 30 days
$12.99$0.93 per GB- Lowest total price for 7 days
- Hotspot allowed
- 3Best price per GB
Orange Travel
20 GB · 14 days
€14.99€0.75 per GB- Lowest price per GB for this trip
- Networks: NTT Docomo, KDDI (au), SoftBank, and Rakuten Mobile
- Hotspot allowed
Three steps, three questions: the best unlimited plan, the cheapest and the best price per GB, from three different providers. How we pick the podium · Affiliate links
Optus or an eSIM in Japan: our verdict
Depending on your plan and trip length, at the prices read on October 22, 2026.
Your Optus plan
Not included
No plan on Optus’s rate sheet includes Japan: data there costs extra.
With Optus
A$5.00/day
Optus Daily Roaming. For 7 days and 6 GB, expect A$35.00.
Affiliate links
Data in Japan with Optus: our analysis
What Optus’s rate sheet and eSIM prices show, as checked on October 22, 2026.
The right pass for your trip length
- 3 days3 × Optus Daily RoamingA$15.00
- 1 week7 × Optus Daily RoamingA$35.00
- 2 weeks14 × Optus Daily RoamingA$70.00
- 1 month5 × International Roaming add-on $25, 14 days, 5GBA$125.00
Against the cheapest eSIM
Optus charges in AUD and the cheapest eSIM is sold in USD: we convert nothing. For a week, expect A$35.00 with Optus and $12.99 with the eSIM (GoMoWorld).
eSIMs in Japan at a glance
- In Japan, we compare plans from 9 eSIM providers: Airalo, GigSky, GoMoWorld, Jetpac, Nomad, Orange Travel, PlanJapan, Ubigi, and Yesim.
- The cheapest unlimited plan for a week is from PlanJapan: $33.00 (Unlimited · 7 days).
- Locally, the cheapest prepaid SIM card for a week costs ¥2,980 excl. tax (IIJmio, 6 GB, 30 days); see our SIM card comparison in Japan.
- A pocket WiFi rents from ¥5,280 a week (eConnect Japan); see pocket WiFi rental in Japan.
Optus applies the same rate in 23 other destinations we track, including Canada, China, Egypt, France, and Greece.
Plan by plan
What applies in Japan depending on your Optus plan.
What Optus’s official rate sheet sets out in Japan, offer by offer. No plan includes it: each offer below is charged on top of your subscription.
| Plan or offer | Data in Japan | Good to know |
|---|---|---|
| Optus Daily Roaming | A$5.00/day | 5GB per 24 hours (another 5GB auto-added for AUD 5 if used up) plus unlimited standard national talk and text. Destination is on the Zone 1 list; available on Choice Plus/Promo Plus plans, Qantas plans and MBB plans. |
| Optus $10 Roaming Pass | A$10.00/day | 1GB per 24 hours plus unlimited standard talk and SMS (selected postpaid plans) |
| Optus Prepaid | A$5.00/day | International Roaming add-on $5 (1 day, 1GB) |
| Optus Prepaid | A$25.00 for 14 days | International Roaming add-on $25 (14 days, 5GB) |
| Optus Prepaid | A$45.00 for 28 days | International Roaming add-on $45 (28 days, 10GB) |
What your trip costs
With the Optus roaming rate, against today’s cheapest eSIM, for everyday use.
| Trip | With Optus | Cheapest eSIM | The offer |
|---|---|---|---|
| 3 days · 3 GB | A$15.00 3 × Optus Daily Roaming | $4.99 GoMoWorld | See the plan |
| 7 days · 6 GB | A$35.00 7 × Optus Daily Roaming | $12.99 GoMoWorld | See the plan |
| 14 days · 12 GB | A$70.00 14 × Optus Daily Roaming | $12.99 GoMoWorld | See the plan |
| 30 days · 24 GB | A$125.00 5 × International Roaming add-on $25, 14 days, 5GB | $24.99 GoMoWorld | See the plan |
Affiliate links
Japan with other Australian carriers
The same trip with the other Australian carriers we track, from their official rate sheets.
None of the 3 Australian carriers we track includes Japan in a plan.
| Carrier | Included with | A week (6 GB) |
|---|---|---|
 Vodafone Australia | — | A$35.00 $35 Roaming Add-on, 7 days, 7GB, 350 min, 250 texts |
 Telstra | — | A$45.00 3 × 7 Day Travel Pack, 2GB, 25 SMS/MMS, 25 min |
Turn off Optus roaming and use an eSIM
Four settings, before you leave or on the plane.
- 1
Install the eSIM at home
Buy it and scan its QR code before you leave: with most providers, the plan only starts when you first connect at your destination.
- 2
Keep Optus for calls
In your settings, keep your Optus line for calls and texts, and pick the eSIM for mobile data.
- 3
Turn off Optus roaming
On iPhone: Settings › Cellular › your Optus line › Data Roaming. On Android: Settings › Mobile networks › Roaming.
- 4
Keep eSIM roaming on
A travel eSIM uses the local networks: its data roaming must stay on.
Optus roaming in Japan: your questions
Answered from the Optus price guide and today’s prices.
Is data in Japan included in my Optus plan?
No, not with the standard Optus plan: A$5.00/day (Optus Daily Roaming).
How much does data cost in Japan with Optus?
A$5.00/day (Optus Daily Roaming), so A$35.00 for 7 days and 6 GB. An eSIM covering the same week costs from $12.99 (GoMoWorld), checked on October 22, 2026.
Which Optus pass should I get for Japan?
The best Optus option depends on how long you stay: for 3 days, 3 × Optus Daily Roaming (A$15.00); for a week, 7 × Optus Daily Roaming (A$35.00); for two weeks, 14 × Optus Daily Roaming (A$70.00); for a month, 5 × International Roaming add-on $25, 14 days, 5GB (A$125.00).
Optus or an eSIM in Japan: which is cheaper?
Optus charges in AUD and the cheapest eSIM is sold in USD: we convert nothing. For a week, expect A$35.00 with Optus and $12.99 with the eSIM (GoMoWorld).
Which Australian carriers include Japan?
None of the 3 Australian carriers we track includes Japan in a plan.
Which network does an eSIM use in Japan?
Depending on the plan, the 9 providers we compare in Japan list SoftBank, KDDI (au), NTT Docomo, and Rakuten Mobile.
How do I avoid roaming charges in Japan?
Use a travel eSIM for data and turn off data roaming on your Optus line. You keep your number for calls and texts.
Can I keep my Optus number with an eSIM?
Yes, on an eSIM-compatible phone: your Optus line stays on for calls and texts while the eSIM carries the data.
China
India
Indonesia
Singapore
South Korea
Thailand
Vietnam