Image of STOP malicious calls

The following provides an overview of the various countermeasures that DOCOMO undertakes with regards to the so called "one-ring" call phenomenon in which users are lured into calling back a number in the received call history that connects to a dating agency or adult content provider.
To avoid unexpected trouble, be especially careful with regards to calling (calling back) any phone number that you do not know in your received call history.

Countermeasures for One-Ring Calls

A call from an unknown number that ends after one ring is a "one-ring call". If you call back the number from your received call history, you may be connected to a dating agency or adult content provider that will bill you an outrageous call charge. This page introduces the countermeasures for malicious calls that use such deceptive means.

Countermeasures for One-Ring Calls (in Japanese only)

Countermeasures for Prank Calls, Repeated Wrong Number Calls, and Other Nuisance Calls

This page introduces countermeasure for blocking prank calls and repeated wrong number calls.

Countermeasures for Prank Calls, Repeated Wrong Number Calls, and Other Nuisance Calls (in Japanese only)

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