AT&T today altered the cost and structure of its 10GB (and higher) Mobile Share Plan, representing a significant savings for families or small businesses. Starting today, two smartphones can get unlimited voice minutes and messaging plus 10GB of data for $130 per month. Each additional smartphone line costs another $15 per month, so three lines will cost $145, four lines will cost $160, and five lines will cost $175. The same rates apply for up to 10 lines. AT&T said this promotion does not apply to GoPhone plans nor machine-to-machine lines.


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