The four million mark was passed on July 22nd. Docomo attributed the faster pace to its recent introduction of a new lineup of a Xi-compatible smartphones. Going forward, the company aims to deliver enhanced customer satisfaction with its Xi smartphones, as well as compatible mobile Wi-Fi routers and other devices, and services such as Xi Talk 24 for free, unlimited voice calls between Xi subscribers.
- In June 2012, DOCOMO announced flat-rate billing plans for Xi compatible smartphones, tablets and other data communication devices from October 1. The new offerings are lower cost than existing plans and are expected to benefit light users who do not download large-sized data such as video content. "Xi Pake-hodai Light" and "Xi Data Plan Light Ninen" plans will be available for 4,935 yen (including tax) per month, and the "Xi Data Plan Light" plan will be available for 6,405 yen (including tax) per month. Downlinks at a maximum of 75 Mbps will be available for up to 3 GB of data. For users who exceed 3 GB in a given month, the downlink speed will be reduced to a maximum of 128 Kbps for the remainder of that month, although users will have the option of continuing service at a maximum of 75 Mbps by paying an additional 2,625 yen (including tax) per 2 GB.