Carriers do work to offer service plans that are more affordable and can attract more smartphone users, he said. In a recent example, AT&T launched a subsidiary, Aio Wireless, in mid-May to provide monthly plans from $35 to $70 a month for unlimited talk, text and data. Phones range from $50 to $650, the latter for a iPhone 5.
Even so, smartphone adoption beyond existing demographic groups in the U.S. will come at a slower pace than in recent boom years, Llamas said.
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