NTT docomo is the first Japanese carrier to release the Sony Xperia Z4 (SO-03G), with the phone ready to pick up in stores or order online. NTT docomo announced a day-one firmware update for the device relating to a reduction in speaker volume under certain conditions. The new update moves the firmware build number from 28.0.B.0.446 to version 28.0.B.0.457. NTT docomo has priced the Xperia Z4 at 93,312 yen (£488, €669, $744). Other Japanese carriers will launch the Xperia Z4 over the next couple of days, with au releasing it tomorrow (11 June) and SoftBank releasing it on 12 June.