[問題] 5s和galaxy j的4g速度已回收
平常拿5s，電信是遠傳
在住家網路4g速度大約是40-45m左右
最近得到一隻galaxy j 也是4g機
把我的卡轉到J試試看後
發現雖然也是顯示4g訊號
但速度卻只有4-8m左右
為何呀！ J不是也支援4g而且也顯示4g了呀
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