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Singtel Japan roaming: Coverage, data allowance, and price
Learn about Singtel Japan roaming plans, pricing, and data options. Compare, save, and stay connected on your next trip.
Planning a trip to Japan? If you’re a Singtel user in Singapore, getting mobile internet in Japan will be no problem. There is a wide variety of Singtel Japan roaming plans, allowing you to roam without switching SIM cards.
In this guide, we’ll walk you through the different Singtel Japan roaming plans, their pricing, and how much data they include. Finally, we’ll introduce Holafly’s unlimited eSIM as an alternative for travelers who want more flexibility and long-term coverage.
Get connected quicker
Buy, set up, and activate a Holafly eSIM for Japan in no more than a few of minutes.
What is Singtel Japan roaming?
Singtel is a major mobile provider in Singapore, offering both postpaid and prepaid plans to suit a variety of users. There isn’t a standalone Singtel Japan roaming plan, but several roaming add-ons are available if you need more data or flexibility.
Singtel’s Japan roaming is supported through NTT DoCoMo, SoftBank Corp, and KDDI networks, ensuring reliable coverage during your trip.
Below, we’ll break down the available Singtel Japan roaming plans, their pricing, and data allowances so you can choose the option that fits your travel needs.
Singtel postpaid plans for Japan
Postpaid Singtel users have access to a range of add-on roaming plans, making it straightforward to stay connected while visiting Japan. These add-ons can be purchased through the My Singtel app. Some options are also available via the Singtel website chatbot or by phone call.
| Plan name | Data allowance | Price (SGD) / Duration |
|---|---|---|
| ReadyRoam Asia | 4GB | $18 / 30days |
| ReadyRoam Worldwide | 6GB | $40 / 30days |
| ReadyRoam Others | 1GB | $60 / 30days |
| UnlimitedRoam Asia | Unlimited* | $35 / 14 days |
| UnlimitedRoam Worldwide | Unlimited* | $45 / 14 days |
| DataRoam Unlimited Daily | Unlimited** | $25 / 1 day |
| SMSVoiceRoam Asia | Voice/SMS only | $5 / 30 days |
| SMSVoiceRoam Others | Voice/SMS only | $10 / 30 days |
*Based on Singtel’s Fair Usage Policy, users can enjoy the first 15GB of high-speed data.
**The daily fair usage limit for DataRoam unlimited daily is subject to change without prior notification depending on network capacity and traffic management.
All plans must be activated within 30 days of purchase. For ReadyRoam plans, if you use up your data limit before the validity period runs out, you’ll automatically be charged for a data add-on. For example, if you finish a 4GB ReadyRoam Asia plan, another 4GB will be added automatically for $18.
Although Singtel roaming data plans don’t include voice calls or SMS, you can add the SMSVoiceRoam plan if you need to make calls or send texts in Japan.
Singtel prepaid plans for Japan
If you are using a Singtel prepaid plan, you can stay connected in Japan by purchasing a hi!DataRoam Plan via the hi!App. The add-on roaming option is 7-day Asia Prepaid DataRoam (Plan B), which costs $20 for 6GB of data.
This plan also covers other destinations across Asia, including China, South Korea, Australia, and India. In Japan, the plan works with Singtel’s local partners NTT DoCoMo, SoftBank Corp, and KDDI.
Once you purchase the plan, it activates immediately with a consecutive 7-day period. Any unused data will expire at the end of the validity period, so it’s important to plan your usage accordingly.
Singtel Japan Pay-per-use charges
If you use mobile data in Japan without an active roaming plan, Singtel’s pay-per-use rates are $25 per MB, which can quickly become very expensive.
Singtel will send SMS alerts when your pay-per-use charges reach certain limits. To avoid high roaming charges while in Japan, it’s recommended to activate a roaming add-on plan or get a travel eSIM before your trip.
Should I get a SIM card when traveling to Japan?
If you’re heading to Japan, another option to stay connected is to use a local SIM or eSIM, instead of relying solely on a Singtel roaming plan. This can be especially useful for travelers who need a large amount of data, more flexibility, or are staying for an extended period.
Before your trip, estimate how much data you’ll need, based on your plans for navigation, streaming, messaging, or social media. Choosing the right data package ahead of time can help you avoid high roaming fees while in Japan.
Travel Japan worry-free with Holafly’s unlimited eSIM
If you need unlimited data or longer-term coverage, consider getting the Holafly eSIM for Japan instead, with prices starting from USD $3.90 per day.
Holafly’s eSIM offers unlimited data, strong network coverage, and 24/7 customer support, making it a convenient choice for trips of any length. Plans are available with flexible durations, and for travelers who need ongoing connectivity, the Holafly Plans pay-monthly eSIM subscription with near-worldwide coverage for as little as USD $49.90 per month.
Avoid excessive roaming fees
Don't get caught out by data roaming charges in Japan. Use local networks at local rates.
Disclaimer: The data in this article is accurate as of September 18th, 2025, and is subject to change.
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Formerly a travel journalist turned marketing copywriter, I found my way back to the travel world with Holafly—my dream company that made remote work possible. My motto? “Dream big and make it happen.” I’m passionate about writing, exploring the world, and staying active through walking, running, swimming, and hiking. I also love learning, reflecting, and connecting with inspiring minds.
