4G LTEBoth iPhone 5S and 5C support speedy 4G LTE mobile data.
The old iPhone 4s maxes out at HSPA+ speeds for GSM carriers (like AT&T or T-Mobile in the US), which are faster than 3G, but slower than LTE. If you're on a CDMA carrier (like Verizon or Sprint in the US), then the 4S only supports slower 3G.
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