Since January 2006, a version called () has been incorporated into mobile FeliCa wallet phones by Japan's mobile operators. This system includes Java applications to manage the Suica function in the mobile phone, to recharge the Suica stored in the mobile phone, review the stored value and perform other functions via the mobile phone. An enhancement for 2007 will allow for Suica charges to be added directly to the phone bill, eliminating the requirement to constantly add to and monitor the remaining balance. On May 23, 2011, JR announced debut of Mobile Suica app for Android Smartphones supporting Osaifu-Keitai.