Japan"s KDDI, the second-biggest mobile phone operator in Japan after NTT DoCoMo, has announced it aims to offer a cellphone service to mainly Japanese customers (according to a spokesman) in the United States using a network operated by Sprint Nextel. Tokyo-based KDDI will offer services using CDMA standard, developed by Qualcomm, and adopted by U.S. carriers such as Verizon and Sprint Nextel. Japanese operators have been eyeing new sources of revenue abroad as they expect slower subscriber growth in the saturated home market. The Asahi newspaper said KDDI aimed for a full U.S. roll-out by the middle of this month, offering phones made by makers such as Sanyo Electric under the KDDI Mobile brand.