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The data allowances start at $50 per month for one gigabyte. That’s enough for a prudent couple with two smartphones who use Wi-Fi a lot, but Verizon recommends getting two gigabytes for $60. After that, each additional two gigabytes cost an extra $10 per month.

Under “Share Everything,” Verizon will stop charging extra for letting devices act as “mobile Wi-Fi hotspots.” That means subscribers who have a recent smartphone could use it to connect a tablet to the Internet, without paying the extra $10 per month for a tablet.

Moffett sees the new plan as cementing the dominance of Verizon and the No. 2 carrier, AT&T. That’s because the shared-data plan encourages a family to use devices from one company, rather than spreading out the bills.

“In a household with two or three AT&T or Verizon devices _ say, a smartphone and a tablet or two, and one device from T-Mobile or Sprint … Sprint doesn’t stand a chance,” Moffett said.

Verizon had telegraphed the move toward shared plans, but had not revealed details or pricing.

Verizon Wireless has 93 million subscribers on its plans. It’s a joint venture of New York-based phone company Verizon Communications Inc. and Vodafone Group PLC, a British cellphone company with wide international interests.

Verizon shares rose 38 cents to close at $42.94. In afternoon trading, the shares hit a four-year high of $42.95.

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Peter Svensson can be reached at http://www.twitter.com/petersvensson