However, from September 1, 2012 until March 31, 2014, subscribers to the "Docomo Wi-Fi" plan will be granted free access to the 30,000+ access points Docomo has placed in stations, airports, cafes, and similar locations. By March 2013, Docomo claims they will nearly double the number of access points.
After the campaign expires, hot spot access will remain free, forever, as long as you fulfill the requirements by subscribing to both 1) an Xi (LTE) or Foma (3G) mobile data plan and 2) a blackberry, Mopera, or SP Mode ISP*
また、キャンペーン期間中から継続して適用条件を満たす限り、キャンペーン期間終了後も「ｄｏｃｏｍｏ Ｗｉ－Ｆｉ」の月額使用料３１５円を無料といたします。Xi data plan subscribers are currently receiving heavy discounts until September. Accordingly, Xi subscribers will not be eligible until the Xi data discounts end on October 1. At the same time, the Xi Lite plan will become available.
Existing subscribers to the "Docomo Wi-Fi" service will automatically receive the discount. Those who aren't currently subscribed will need to add the plan. There is an app on the market called docomo Wi-Fi かんたん接続 to simplify connecting from and Android device.
Docomo press release (J)
*all normal Docomo smartphone users will have one of these ISPs. The required data plans are also the standard data plans.