AT&T Inc plans to sharply raise prices on data plans for smartphone and tablet customers from next week, calling the move a response to an explosion in wireless usage.From January 22, AT&T customers will pay $20 for a 300-megabyte monthly data plan, up from $15 for 200-mb currently. Users with higher requirements can also opt for $30 for 3 gigabytes -- versus $25 for 2 GB previously -- or $50 for 5 GB, up from $45 for 4 GB...

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