The IPhone5S A 1530 released by China Unicom after September 20, 20 14 is the first to preset iOS8 and turn on FDD+TDD dual 4G functions. The previously sold version A 1530 can support Unicom 4G after Apple pushes IOS8 upgrade.

If you put the USIM card of Unicom's 4G package on a mobile phone that supports Unicom's 4G network, and your area has covered Unicom's 4G network, you can use Unicom's 4G network.