Question 1

Can I get a SIM card in Japan without a Japanese bank account or credit card?

Accepted Answer

Sometimes. Many prepaid SIMs, eSIMs and some foreigner-friendly MVNOs accept a foreign credit card or cash, so you can get connected before you have a Japanese bank account. The big carriers and many contract MVNOs usually require a Japanese payment method (a Japanese card or bank direct debit).

Question 2

What is the difference between the big carriers and MVNOs (格安SIM)?

Accepted Answer

The big carriers (docomo, au/KDDI, SoftBank, Rakuten) run their own networks and offer full shop support but cost more. MVNOs (格安SIM, "budget SIMs") rent capacity on those same networks, so coverage is similar but prices are much lower. The trade-off is less in-person shop support, more online sign-up, and speeds that can slow at peak times.

Question 3

What do I need to sign up for a phone plan in Japan?

Accepted Answer

Usually your residence card, and often a Japanese payment method (a Japanese credit card or bank account for direct debit). Some plans also ask for a contact phone number, which creates a chicken-and-egg problem with banking. A prepaid SIM or eSIM that accepts a foreign card is a common way to break the loop.

Question 4

Are data-only SIMs available in Japan?

Accepted Answer

Yes. Data-only SIMs are widely offered and are cheaper than voice plans, but they do not come with a phone number for regular calls. They work well if you rely on apps like LINE, WhatsApp or web calling instead of a traditional voice number.

Question 5

Can I keep my phone number if I switch carriers?

Accepted Answer

Yes. Japan supports number portability (MNP). You request an MNP number from your current provider and give it to the new one when you sign up, so you keep the same phone number when you move to another carrier or MVNO.

Question 6

Which mobile options work for short stays or a Working Holiday?

Accepted Answer

For short stays, a prepaid SIM, an eSIM, or a travel SIM is usually the simplest choice, since they avoid long contracts and often accept foreign cards. For a Working Holiday of several months, a budget MVNO can be cheaper once you have a residence card and a way to pay.

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