iPhone 4s update 到 iOS 5.1 後 在 美國出現 4G，
HSPA+ 嚴格來說不算 4G， 但是因為 HP 等其他公司 把他們的 HSPA+ 手機也宣傳成 4G 手機
所以 AT&T 與 Verizon 也 把 用 到 HSPA+ 功能 的 iPhone 4s 列為 4G
ananadtech： iPhone 4s 顯示 4G 的原因， 是因為它確實有 HSPA+
Apple hasn't stated what baseband is in the iPhone 4S (and I guess we won't know absolutely for certain until it gets opened up), but it is almost without doubt MDM6600 just like the Verizon iPhone 4. The specs all line up, and while that part doesn't include 64QAM on the downlink, it does include a number of the other HSPA+ features I've mentioned, and is thus 3GPP Rel.7 and therefore "HSPA+."
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