iphone6a1589为什么不能用联通3g?

iphone6a1589属于移动定制版，国内是屏蔽WCDMA制式，国际漫游状态才能开通使用。联通号码在此款手机中只能使用2G网络。

The iPhone 6 A1589 is compatible with TD-SCDMA 1900 (F), 2000 (A) as well as TD-LTE bands 38, 39, 40, 41, and GSM/EDGE (850, 900, 1800, 1900 MHz). Notably, the model also supports UMTS (WCDMA)/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz) and FDD-LTE (band 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29) but they apply only to international roaming. That means 3G and 4G LTE of this phone won’t be compatible with China Telecom and China Unicom.
支持移动的td-scdma，对联通和电信不完全适用，其支持的wcdma和fdd-lte等只能用于国际漫游