JAPAN
1 KDDI au roaming option from KDDI au's official pages, checked 24 Oct 2026. See what each option costs over a trip and how it compares with a Graba SIM travel eSIM.
QUICK ANSWER
KDDI au (Japan) does not publish one fixed roaming price we could verify — it depends on your plan and destination. It offers 1 roaming option, including Unlimited Data Overseas from-price. A prepaid Graba SIM eSIM for a week in United States costs US$15.75 for 5 GB. Checked on au.com, 24 Oct 2026.
1 ROAMING OPTION
Other options show the plan and its terms; open the official page for the current price on your plan.
Price depends on your plan — check with KDDI au
Individual retail customers; plan eligibility as stated Amount is FROM ¥800 per 24h; exact charge varies by destination and requirements
SKIP THE ROAMING BILL
Prepaid Graba SIM data for a week away. Keep your home SIM on for calls and texts with its data roaming off.
BEFORE YOU FLY
KDDI au prices depend on the destination zone and your plan. Open the official page linked here and find your destination before you fly.
Keep your home line on if you need calls or verification texts, but turn its Data Roaming off.
Install over Wi-Fi before you leave, then switch it on when you land.
Choose the travel eSIM for mobile data and turn automatic data switching off.
SOURCES
Official operator website · checked 24 Oct 2026
OFFICIAL_DOMAIN_RETRIEVED — tariff may change
GOOD TO KNOW
KDDI au does not publish one fixed roaming price that we could verify — it depends on your plan and destination. We list 1 KDDI au roaming option on this page; follow the official link for the price on your plan.
It often is for trips of more than a few days, because a prepaid eSIM is one payment for the whole trip. Compare KDDI au's price for your plan with a Graba SIM plan for your destination.
Before you land, open Settings and turn Data Roaming off for your KDDI au line (iPhone: Mobile Service or Cellular; Android: SIMs or Mobile network). Turn off automatic data switching too. To avoid calls and texts being charged, turn the KDDI au line off or use Wi-Fi calling where KDDI au allows it.
Yes, on a dual-SIM phone. Keep your KDDI au line on for calls and texts with its Data Roaming off, and set the Graba SIM eSIM as your mobile data line. KDDI au may still charge for calls, texts and voicemail abroad.
From KDDI au's own website, last checked 24 Oct 2026. Each option links to the page it came from. Graba SIM is not affiliated with KDDI au.
HOW WE CHECK
The price, currency and how it is charged were read from the operator's own website on the date shown.
The operator explains its roaming rules, but not as one fixed price — for example, inclusive roaming that depends on your plan.
The plan exists, but its price depends on your contract or destination. Use the official link to see yours.
Recorded in an earlier research pass and not re-checked yet. We show the plan name and terms, never the old price.
A blank price means we could not verify one — never that it is free. Prices include or exclude tax as the operator publishes them. Snapshot: 25 October 2026. Logos are trademarks of their owners and identify each network only; Graba SIM is not affiliated with these operators.
