The cost of migration to support a network for 3.9-generation phones could cost as much as 150 billion yen ($1.9 billion), it said.
Japan's Communications Ministry allocated the coveted 900 MHz spectrum in February to smaller rival Softbank Corp, which supplies Apple Inc's iPhone in Japan along with KDDI Corp. ($1 = 79.9100 Japanese yen)
(Reporting by Mayumi Negishi; Editing by Michael Watson)
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