UPDATE 4-Verizon sells phone lines to Frontier for $5.25 bln

* Frontier to pay $5.25 bln in stock for Verizon lines

* Frontier expects $500 mln annual savings

* Deal to close within 12 months

* Frontier shares down 4 pct, Verizon down 1.6 pct (Adds Verizon comment, union comments, share price update)

By Anupreeta Das and Sinead Carew

NEW YORK, May 13 (Reuters) - Verizon Communications Inc (VZ.N) will sell 4.8 million rural phone lines to Frontier Communications Inc (FTR.N) for $5.25 billion in stock, getting rid of a declining business to focus on wireless and broadband services.

The deal will triple the size of Frontier, making it the largest rural-only service provider in the United States. Frontier, whose shares fell slightly, said the deal will boost earnings and provide $500 million of annual savings.

On the closing of the deal, Frontier will take on $3.3 billion of Verizon debt and Verizon shareholders will receive Frontier stock giving them up to a 71 percent stake in Frontier.

It comes amid a wave of consolidation in the rural phone market, as providers seek to cut costs as more consumers cancel landlines. Last year, CenturyTel Inc (CTL.N) announced a deal to buy Embarq Corp (EQ.N) for $5.8 billion of stock.

Frontier Chief Executive Maggie Wilderotter told Reuters she would expand high-speed Internet services, now only in 60 percent of the lines being bought.

"These markets have a lot of upside opportunity from a revenue perspective," Wilderotter said in an interview. "One of the things we're going to be very focused on is bringing broadband to rural America in these 14 states."

Frontier said it needs to cut its per-share dividend to 75 cents a year, from $1, after the deal. On the plus side, the deal reduces its debt-to-equity ratio to 2.6 from 3.8.

This is the latest of several deals where Verizon has shed traditional home phone lines in markets it views as less strategic to focus on more-lucrative wireless customers and nascent video services that compete with cable companies.

"Shareholders see this transaction boosting Verizon's growth rate because it lowers the exposure to declining legacy phone assets while increasing exposure to wireless, video and the enterprise segment," said UBS analyst John Hodulik.

One person familiar with the situation said that Verizon was unlikely to sell any more rural lines after the Frontier deal as it has already sold Hawaii and New England assets.

Verizon said the deal would dilute Verizon's earnings by less then 5 percent in the first year after the deal closed, expected around the middle of 2010 after regulatory approval.