[問題] iphone5 3G升4G IOS需要上8嗎
剛剛去升級4G 18號早上五點就可以換sim卡升4G
但是我IOS版本是7.1.2 我需要上IOS8嗎?
聽說很耗電 有點不想上去
還有電信業者版本我是中華電信16.1版
請問已經升4G的大大 也是中華電信16.1嗎?
還有需要準備什麼嗎?
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