Telecom/IT

Mobile Plan Change

Master the Japanese you need for Mobile Plan Change in natural keigo. Scene-by-scene flow ยท NG examples ยท politeness levels ยท 9-language parallel translations

Synergia Editorial Team

This page helps foreign residents and long-term visitors handle "Mobile Plan Change" with daily Japanese phrases for living in Japan, practical examples, and common mistakes to avoid.

What this page helps you say in Japan

This page focuses on Mobile Plan Change and teaches useful Japanese phrases for daily life in Japan, including natural replies, polite alternatives, and practical wording for foreigners living in Japan.

What You'll Learn on This Page

Practice Phrases (10 Total)

ๆ–™้‡‘ใƒ—ใƒฉใƒณใฎ่ฆ‹็›ดใ—ใ‚’ใŠ้ก˜ใ„ใ—ใพใ™

ใ‚Šใ‚‡ใ†ใใ‚“ใƒ—ใƒฉใƒณใฎใฟใชใŠใ—ใ‚’ใŠใญใŒใ„ใ—ใพใ™

I'd like to review my plan.

POINTStart with a consultation

ๆฏŽๆœˆใฎใƒ‡ใƒผใ‚ฟไฝฟ็”จ้‡ใฏ15GBใใ‚‰ใ„ใงใ™

ใพใ„ใคใใฎใƒ‡ใƒผใ‚ฟใ—ใ‚ˆใ†ใ‚Šใ‚‡ใ†ใฏใ˜ใ‚…ใ†ใ”ใ‚ฎใ‚ฌใใ‚‰ใ„ใงใ™

My monthly data usage is around 15GB.

POINTUnderstanding your usage is the first step

ใ‚‚ใ†ๅฐ‘ใ—ๅฎ‰ใ„ใƒ—ใƒฉใƒณใฏใ‚ใ‚Šใพใ™ใ‹

ใ‚‚ใ†ใ™ใ“ใ—ใ‚„ใ™ใ„ใƒ—ใƒฉใƒณใฏใ‚ใ‚Šใพใ™ใ‹

Is there a cheaper plan available?

POINTFrankly express your desire to save money

็„กๅˆถ้™ใƒ—ใƒฉใƒณใซใ—ใŸใ„ใงใ™

ใ‚€ใ›ใ„ใ’ใ‚“ใƒ—ใƒฉใƒณใซใ—ใŸใ„ใงใ™

I'd like to switch to an unlimited plan.

POINTFor heavy users

ๅฎถๆ—ๅ‰ฒใฏ้ฉ็”จใงใใพใ™ใ‹

ใ‹ใžใใ‚ใ‚Šใฏใฆใใ‚ˆใ†ใงใใพใ™ใ‹

Can I apply for the family discount?

POINTIt may be possible to use names other than the same address and last name.

ๅญฆ็”Ÿใชใฎใงใ™ใŒใ€ๅญฆๅ‰ฒใฏใ‚ใ‚Šใพใ™ใ‹

ใŒใใ›ใ„ใชใฎใงใ™ใŒใ€ใŒใใ‚ใ‚Šใฏใ‚ใ‚Šใพใ™ใ‹

I'm a student. Is there a student discount?

POINTStudent ID required

ไฝฟใ‚ใชใ„ใ‚ชใƒ—ใ‚ทใƒงใƒณใ‚’ๅค–ใ—ใŸใ„ใงใ™

ใคใ‹ใ‚ใชใ„ใ‚ชใƒ—ใ‚ทใƒงใƒณใ‚’ใฏใšใ—ใŸใ„ใงใ™

I want to remove options I don't use.

POINTSave hundreds to thousands of yen per month

ใƒ—ใƒฉใƒณๅค‰ๆ›ดใฏใ„ใคใ‹ใ‚‰้ฉ็”จใ•ใ‚Œใพใ™ใ‹

ใƒ—ใƒฉใƒณใธใ‚“ใ“ใ†ใฏใ„ใคใ‹ใ‚‰ใฆใใ‚ˆใ†ใ•ใ‚Œใพใ™ใ‹

When will the plan change take effect?

POINTUsually from the 1st of the following month

ๆ—ฅๅ‰ฒใ‚Š่จˆ็ฎ—ใซใชใ‚Šใพใ™ใ‹

ใฒใ‚ใ‚Šใ‘ใ„ใ•ใ‚“ใซใชใ‚Šใพใ™ใ‹

Will it be prorated?

POINTDepends on plan

ๅค‰ๆ›ดๅพŒใฎๆœˆ้กใ‚’ๆ•™ใˆใฆใใ ใ•ใ„

ใธใ‚“ใ“ใ†ใ”ใฎใ’ใคใŒใใ‚’ใŠใ—ใˆใฆใใ ใ•ใ„

Could you tell me the new monthly fee?

POINTCheck the total amount including options

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Frequently Asked Questions

Q. Is there a fee for changing plans?
A. It's basically free. Due to legal reforms since 2019, it has become free for almost all carriers.
Q. When will plan changes take effect?
A. Effective from the 1st of the following month for many carriers. It is rare for plans to be reflected within the current month.
Q. How can I check my data usage?
A. You can check using your carrier's official app (My docomo/My au, etc.) or by logging in online. You can also check the "Mobile data communication" settings.
Q. What are the conditions for family discount?
A. Same address or same last name. Recently, an increasing number of carriers are allowing separate families (by unifying billing addresses).
Q. When can I apply for student discount?
A. It is usually held from November to May every year. Many of the careers are for people under the age of 22, and foreign students can apply if they have a student ID.