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[问与答] 国内手机频段在国外使用时的影响？

发表于
以一加 12R （ Ace3 ）为例，国内版频段为：
GSM：850/900/1800MHz
CDMA：BC0 （ 1x ）
WCDMA：Bands 1/4/5/8
LTE FDD：Bands 1/3/4/5/8/18/19/26/28A
LTE TDD：Bands 34/38/39/40/41
5G NR：n1/n3/n5/n8/n28A/n41/n77/n78
美版频段为：
LTE/LTE-A
4×4 MIMO, Supports up to DL Cat 19/UL Cat 18 (1800Mbps /200Mbps)
LTE
WCDMA: Bands 1/2/4/5/8
GSM: 850/900/1800/1900MHz
LTE-FDD: Bands 1/2/3/4/5/7/8/12/13/17/18/19/20/25/26/28/30/66/71
LTE-TDD：Bands 38/39/40/41/48
5G NR: n1/ n2/ n3/ n5/ n7/ n8/ n20/ n25/ n28A/ n38/ n40/ n41/ n66/ n71/ n77/ n78

缺少的部分是什么原因？
国外使用时有什么影响？

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