NTT Docomo—NTT Docomo shared 344,213 customers' phone numbers and plan data with Amazon Japan without consent
NTT Docomo disclosed on September 16, 2026 that a configuration error introduced during a February 2026 system update to its online contract process caused the consent mechanism for sharing customer data with Amazon Japan to be omitted. As a result, telephone numbers and pricing-plan names for 344,213 mobile lines were shared with Amazon Japan without customer consent between April 21 and August 20, 2026. Amazon Japan deleted the information after being notified.
Scoring Impact
| Topic | Direction | Relevance | Contribution |
|---|---|---|---|
| Data Security | -against | secondary | -0.50 |
| User Privacy | -against | primary | -1.00 |
| Overall incident score = | -0.429 | ||
Score = avg(topic contributions) × significance (medium ×1) × confidence (0.57)
Evidence (1 signal)
NTT Docomo discloses unauthorized sharing of data from 344,213 mobile lines with Amazon Japan
NTT Docomo announced September 16, 2026 that a configuration error in a February 2026 system update caused telephone numbers and pricing-plan names for 344,213 mobile lines to be shared with Amazon Japan without consent between April 21 and August 20, 2026. Amazon Japan deleted the data after notification.