Japan
Name

Japan

ISO Code

JP

Region

Asia

Mobile Country Code

440

Dialing code

+81

Major carriers

NTT DoCoMo, SoftBank Mobile, KDDI, eMobile

Guidelines for Japan
Two-way SMS supported

No

Number portability available

Yes

Twilio concatenated message support

No

Twilio MMS support

Not Available

Sending SMS to landline numbers

You cannot send SMS to a landline destination number: the Twilio REST API will throw a 400 response with error code 21614, the message will not appear in the logs, and the account will not be charged.

Best practices

Ported numbers may not be able to recieve SMS from Twilio.

Unless they are preregistered, messages that contain 'http://' may be filtered by Au (KDDI).

Some mobile phones that were once part of the Wilcom network (now Y!Mobile) are incapable of receiving SMS.

Some Japanese carriers provide a feature called 'Anzen Block' that prevents subscribers from receiving SMS from non-Japanese numbers.

Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to ensure they comply with all applicable laws. The following are some general best practices:

  1. Get opt-in consent from each end user before sending any communication to them, particular for marketing or other non-essential communications.
  2. Only communicate during an end user's daytime hours unless it is urgent.
  3. SMS campaigns should support HELP/STOP messages, and similar messages, in the end user's local language.
  4. Do not contact end users on do-not-call or do-not-disturb registries.
Phone Numbers and Sender ID
Preregistered
Operator network capability

Supported

Twilio supported

Supported

Sender ID format

Alphanumeric

Sender ID preserved

Supported

Two-way support

Not supported

Provisioning time

2-3 weeks

Cost
--
Throughput (messages per second)

10 messages/second

Use case restrictions
--
Best practices
--
Alphanumeric
Operator network capability

Supported except to KDDI Japan

Twilio supported

Supported except to KDDI Japan

Sender ID format

Alphanumeric

Sender ID preserved

Supported except to KDDI Japan

Two-way support

Not Supported

Provisioning time
--
Cost

--

Throughput (messages per second)

10 messages/second

Use case restrictions

--

Best practices
--
Long Code
Operator network capability

Supported

Twilio supported

Supported

Sender ID format

--

Sender ID preserved

Supported

Two-way support

--

Provisioning time

--

Cost

--

Throughput (messages per second)

10 messages/second

Use case restrictions

--

Best practices
--
Short Code
Operator network capability
--
Twilio supported

Not supported

Sender ID format
--
Sender ID preserved

Not supported

Two-way support

Not supported

Provisioning time
--
Cost
--
Throughput (messages per second)
--
Use case restrictions
--
Best practices
--
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