JAPAN
4 NTT docomo roaming options from NTT docomo'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
NTT docomo (Japan) does not publish one fixed roaming price we could verify — it depends on your plan and destination. It offers 4 roaming options, including Sekai Sonomama Giga 1h; Sekai Sonomama Giga 24h and Sekai Sonomama Giga 2 days. A prepaid Graba SIM eSIM for a week in United States costs US$15.75 for 5 GB. Checked on dcm-dpweb51.tz.nttdocomo.co.jp, 24 Oct 2026.
4 ROAMING OPTIONS
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 NTT docomo
Individual retail customers; plan eligibility as stated Uses subscribed Japanese domestic data allowance; service activation required
Price depends on your plan — check with NTT docomo
Individual retail customers; plan eligibility as stated Uses subscribed Japanese domestic data allowance; service activation required
Price depends on your plan — check with NTT docomo
Individual retail customers; plan eligibility as stated Uses subscribed Japanese domestic data allowance; service activation required
Price depends on your plan — check with NTT docomo
Individual retail customers; plan eligibility as stated Uses subscribed Japanese domestic data allowance; service activation required
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
NTT docomo 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
NTT docomo does not publish one fixed roaming price that we could verify — it depends on your plan and destination. We list 4 NTT docomo roaming options 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 NTT docomo'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 NTT docomo 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 NTT docomo line off or use Wi-Fi calling where NTT docomo allows it.
Yes, on a dual-SIM phone. Keep your NTT docomo line on for calls and texts with its Data Roaming off, and set the Graba SIM eSIM as your mobile data line. NTT docomo may still charge for calls, texts and voicemail abroad.
From NTT docomo's own website, last checked 24 Oct 2026. Each option links to the page it came from. Graba SIM is not affiliated with NTT docomo.
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.
