If you're an AT&T customer with an iPhone 4S, you probably noticed a change if you updated your phone yesterday.
That "3G" symbol in the top left corner of your iPhone now reads "4G."
Why?
Because the AT&T model of the iPhone 4S runs on a type of network called HSPA+, which is slightly faster than the 3G connection you're used to. AT&T brands its HSPA+ network as a "4G" network. It also calls its LTE network, which can be about 10 times faster than 3G, a "4G" network.
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