# NTT Docomo data increase trial

> Live situation record from CLSTR: https://clstr.news/situations/ntt-docomo-data-increase-trial
> Updated: 2026-08-02T03:31:03.000Z. Sources: 4. Developments: 2.

NTT Docomo announced a "Data Increase Trial Campaign" to begin on 1 August 2026. The promotion raises the monthly data allowance for its ahamo plan from 30 GB to 40 GB and expands the docomo mini tiers, moving the 4 GB tier to 6 GB and the 10 GB tier to 12 GB. The increase is applied automatically to both new and existing subscribers without a separate sign‑up, and the campaign has no fixed end date; usage will revert to the original limits when the subscription ends.

Docomo said the trial is intended to observe how larger data caps affect user behavior and to collect feedback through surveys, using the insights to shape future services. The move follows recent competitive pricing actions by rival carriers UQ mobile and Y!mobile, suggesting a strategic effort to strengthen its sub‑brand offerings.

## Timeline

### 2026-08-02: NTT Docomo adds 10 GB to ahamo and docomo mini plans

From 1 Aug 2026 NTT Docomo will automatically add 10 GB to ahamo (30→40 GB) and boost docomo mini plans (4→6 GB, 10→12 GB) with no fee, as a trial to gather usage data.

2 sources. https://clstr.news/cluster/ntt-docomo-adds-10-gb-to-ahamo-and-docomo-mini-plans

### 2026-07-29: NTT Docomo raises ahamo data to 40 GB, adds 2 GB to docomo mini

From 1 Aug 2026 NTT Docomo adds 10 GB to ahamo (30→40 GB) and 2 GB to docomo mini (4→6 GB, 10→12 GB) via a free trial campaign, boosting its plans amid competition.

4 sources. https://clstr.news/cluster/ntt-docomo-raises-ahamo-data-to-40-gb-adds-2-gb-to-docomo-mini

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Cite as: NTT Docomo data increase trial. CLSTR, https://clstr.news/situations/ntt-docomo-data-increase-trial