OCNでんわ

NTT Communications Corporation

About this app

``OCN Phone App'' is an app that can be used by anyone who subscribes to the low-cost SIM ``OCN Mobile ONE Voice-enabled SIM'' provided by NTT Docomo.

You can save on call charges by calling from the OCN phone app or by adding 0035-44 to the beginning of the other party's phone number.
OCN Mobile ONE If you make a call within Japan that can be made using OCN Phone from a voice-enabled SIM, the call will automatically be made to OCN Phone without the need for an app.


・The call quality is the same as that of your mobile phone, such as OCN Mobile ONE voice compatible SIM!
・Your current 090/080/070 number will be displayed to the person you call!
・Easily call back from your smartphone's call history!

1. OCN phone
Application not required
Monthly fee: Free
Domestic call charge: 10 yen/30 seconds (11 yen/30 seconds including tax)

You can use it for 10 yen/30 seconds (11 yen/30 seconds including tax), which is half the normal domestic call charge of 20 yen/30 seconds (22 yen/30 seconds including tax).

2. OCN phone complete unlimited call option
Application required
Monthly fee: 1,300 yen (1,430 yen including tax)
Domestic call charges: Free

This is a voice service that allows you to make unlimited calls within Japan for free for a monthly fee of 1,300 yen (1,430 yen including tax).

3. OCN phone 10 minutes unlimited call option
Application required
Monthly fee: 850 yen (935 yen including tax)
Domestic call charges: Flat rate, 0 yen for up to 10 minutes, 10 yen/30 seconds for more than 10 minutes (11 yen/30 seconds including tax)

This is a voice service that allows you to make unlimited calls within 10 minutes (per call) within Japan for free for a monthly fee of 850 yen (935 yen including tax).

4. OCN phone top 3 unlimited calls option
Application required
Monthly fee: 850 yen (935 yen including tax)
Domestic call charges: Calls to the top 3 numbers 0 yen
Calls to calls other than the 3rd number 10 yen/30 seconds (11 yen/30 seconds including tax)

This is a voice service that costs 850 yen per month (935 yen including tax) and charges 0 yen for calls to the top 3 domestic calling numbers for that month.
Each month, calls to the top 3 OCN numbers with the highest domestic call charges for that month will automatically be reduced to 0 yen.


Please check the official website for details on how to apply for the OCN Phone Unlimited Call Option.

6. How to use
① Sign up for OCN Mobile ONE* voice-enabled SIM
*As of June 26, 2023, we will no longer be accepting new applications.
②Download the OCN phone app
③Call the other party's phone number from the app

■Main functions
・Dial pad
・Call from your smartphone's call history
・Calls from contacts
・Transmission from frequently used items
・Edit contacts and call history
・Contact group settings
・Add 184 when calling
・Cooperation with “OCN Mobile ONE” app
・When making a call, the number prefixed with "0035-44" will be automatically registered as a contact.
・Contact display account filter function
・Confirm usage details


■Notes
・You cannot make calls to the following phone numbers.
1) 3-digit number such as 110, 117, 177, etc.
2) NTT Communications toll-free number, Navi dial, Teledome, etc. 0XX0 number
3) Phone numbers starting with 00XX such as My Line
4) 060, 020, or a phone number starting with #
5) NTT Docomo's "Remote control from another phone" calling number (090-310-14xx, 090-310-1655)
6) Calling number related to SoftBank's "Forwarding/Answering Machine/Incoming Call Notification Function Service"
・Please check the terms of use regarding use of the application.

OCN Phone is one of the main functions of OCN Mobile ONE, a mobile communication service provided by our company.
"OCN Mobile ONE" users can display their mobile phone's incoming and outgoing call history on this app, select the other party from the history, and make a call at the low call charges of "OCN Phone."
The acquired information is not sent to any external server.