At the same time, rising smartphone penetration and the burgeoning data needs of subscribers using mobile devices such as the iPhone is putting a lot of strain on its 3G network that needs additional spectrum for strengthening.

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At the same time, rising smartphone penetration and the burgeoning data needs of subscribers using mobile devices such as the iPhone is putting a lot of strain on its 3G network that needs more investment and additional spectrum for strengthening.

FORBES: AT&T Eyes Data Growth With $14 Billion Network Overhaul