NTT docomo Toughbook P-01K Instruction Manual page 36

Online various procedures, the content confirmation of your contract, etc.
From this mobile phone メニュー (Menu)

From PC My docomo (https://www.nttdocomo.co.jp/mydocomo/)
(DOCOMO online procedures)" (In Japanese only)
●You may not be able to access the site due to system maintenance or depending on the details of your subscription.
●Your "Network Security Code" and "ID/password for d ACCOUNT" is required in order to use "ドコモオンライン手続き (DOCOMO online procedures)".
■From DOCOMO mobile phones
-81-3-6832-6600 (toll free)
Shows the "+" on the display
(to enter "+", press and hold the "0" key for at least one second)
※You can also enter the international access code instead of the "+".
Business hours: 24 hours (open all year round)
●Please confirm the phone number before you dial.
●If you lose your mobile phone or have it stolen, immediately take the steps necessary for suspending the use of the mobile phone.
●If the mobile phone you purchased is damaged, bring your mobile phone to a repair counter specified by DOCOMO after returning to Japan.
 
Web dメニュー・検索 (dmenu/Search)
ドコモオンライン手続き (DOCOMO online procedures) (In Japanese only)
Inquiries from Overseas (loss, theft, unable to connect, etc.)

Mydocomo (お客様サポート) (Mydocomo (User support))
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Select an item in "ドコモオンライン手続き
■From land-line phones
International call access code
Universal number -81-3-6832-6600 (charged)
for the country you stay
international prefix
※You are charged a call fee to Japan.
※For international call access codes, refer to the DOCOMO website.
Business hours: 24 hours (open all year round)