Wireless communications giant NTT Docomo Inc. launched on Friday a lower-priced mobile service plan for customers using high volumes of data, intensifying a price battle with its two rivals that has been spurred by government pressure.

The company's new discounted monthly "ahamo" plan is priced at ¥2,700 excluding tax and includes 20 gigabytes of data usage — the lowest price among the three major wireless carriers for that amount of data — and unlimited calls of up to five minutes.

NTT Docomo said it had accepted applications from over 1.6 million customers as of late February. To cut costs and lower fees, the company and its two rivals — KDDI Corp., the operator of the au brand, and SoftBank Corp. — only take applications for their new discounted plans online.