By Simon Zekaria 

LONDON-- BT Group PLC on Thursday said it agreed to buy mobile operator EE for GBP12.5 billion ($18.98 billion) in cash and stock, a move that returns it to consumer wireless services for the first time in more than a decade.

The deal, which follows several weeks of exclusive talks with EE's owners-- Deutsche Telekom AG of Germany and France's Orange SA--marries the U.K.'s largest fixed-line telecommunications operator and the country's biggest mobile operator, and allows BT to sell bundled offers of fixed-line, mobile, broadband and television services.

It is also the latest sign that European telecom operators are willing to push though deals to join up telecom and media services, seen as boosting subscriber revenue and increasing customer loyalty.

BT said it would raise GBP1 billion by selling shares to fund the takeover, alongside debt. Deutsche Telekom will become BT's largest shareholder with a 12% stake and a board seat, while Orange will hold a stake of 4%. BT said the price reflects a multiple of about six times 2014 cash earnings, adjusted for cost savings.

The takeover gives BT more than 30 million EE customers, of which 24.5 million are direct mobile customers and 834,000 are broadband customers, as well as 580 retail stores and about 15,000 new employees.

It also provides the 168-year-old telecom giant with a sprawling faster-speed fourth-generation wireless network that currently covers some 75% of the U.K. population. BT said EE has the largest 4G customer base of any operator in Europe. Mobile operators are racing to roll out 4G networks to meet customer demand for higher downloading of data-heavy content such as video.

BT said it expects annual savings of GBP360 million by the fourth full year following completion of the transaction. This is equivalent to about GBP3.5 billion before integration costs, or GBP3 billion after integration costs, it said. BT also said it expects to generate extra revenue of about GBP1.6 billion a year.

"This is a major milestone for BT as it will allow us to accelerate our mobility plans and increase our investment in them," said BT Chief Executive Gavin Patterson.

BT shares were up 4.4% at 441.4 pence in morning trading.

The deal is subject to approval by shareholders and the Competition and Markets Authority, a U.K regulator. BT expects completion by the end of its 2016 fiscal year.

But rivals were quick Thursday to raise concerns about an enlarged BT, which already provides over a third of the U.K.'s 25 million residential telecom lines though its hefty infrastructure division. Other operators use the network to provide their own services to customers.

"The important thing is that the regulator has an eye [on] how the new, large BT continues to grant access to their network," said Vodafone Group PLC CEO Vittorio Colao. "There is a clear need for regulatory oversight on this new big market player."

Mr. Patterson noted that other telecom incumbents in Europe have both a fixed and mobile telecom arm. The CEO added that its fixed network is "completely regulated."

BT's deal for EE is the latest move in the U.K.'s rapidly evolving telecom sector, as operators scramble to join up services across communications.

BT offers retail consumers so-called triple-play services of fixed phone, broadband and television, and competes for subscribers with rivals such as pay-TV giant Sky PLC. BT has also invested billions of dollars into sports channels to lever up its broadband business.

Unlike countries such as Spain and Germany, U.K. telecom operators have yet to fully embrace so-called quadruple-play offers of fixed telephony, mobile, broadband and television. But mobile operator Vodafone is moving into the space. Liberty Global PLC's cable operator Virgin Media and telecom group TalkTalk also participate in "quad" play.

Sky reached an agreement to partner with the U.K. business of Spanish mobile-phone operator Telefónica SA, with Sky launching a mobile service for the first time next year. Separately, Li Ka-shing shing's Hong Kong-based conglomerate Hutchison Whampoa, owner of the U.K.'s smallest mobile operator Three, launched exclusive talks to buy Telefónica's larger U.K. wireless rival O2 for potentially more than $15 billion.

Sky is 39%-owned by 21st Century Fox, which until June 2013 was part of the same company as The Wall Street Journal parent News Corp.

BT, which spun off a then-struggling cellphone business in 2001, itself had been looking at O2 as a possible target to return to mobile, before choosing EE.

Thursday's deal highlights a growing recognition by telecom firms that they must offer bundled services to grow. Flagging revenue from fixed-line and mobile is leading companies to bet that a bundled combination of fixed-line, mobile, broadband and media offerings could help jump-start revenue.

Write to Alex MacDonald at alex.macdonald@wsj.com

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