By Shayndi Raice And Ruth Bender 

LONDON-- BT Group PLC said Monday it has entered exclusive talks to buy U.K. mobile operator EE for GBP12.5 billion ($19.6 billion) in cash and stock, a move that would get the British fixed-line giant back into mobile services and further scramble a fast-moving telecoms sector across Europe.

BT said talks were likely to continue for several weeks with EE owners Deutsche Telekom AG of Germany and France's Orange SA. If a deal is reached, BT would partially pay for the deal by offering new shares in itself to EE's owners. Deutsche Telekom would end up with a 12% stake, and a board seat, at BT. Orange's stake in BT would come out to 4%.

The deal highlights a growing recognition by European telecommunications firms that they must offer bundled services to grow. Flagging revenue from fixed-line and mobile is leading companies to bet that so-called triple and quadruple play deals--which bundle a combination of fixed-line, mobile, broadband and media offerings--could help jump-start revenue.

While some other European countries, such as Spain and Germany, have embraced the move to bundle services, the U.K. remains slow to join the convergence trend. The deal could spark a flurry of follow-on activity, as the remaining mobile players seek to position themselves to compete with a more powerful rival in BT.

The talks are the latest in a series of large telecom deal making that is rippling through Europe. Operators want economies of scale to help boost profits, while they face stalling revenue in markets that for the most part are considered mature and have been consumed by price wars.

Earlier this year, Luxembourg-based telecom company Altice SA bought mobile company SFR and merged it with cable group Numericable in France. Altice is also in the process of buying Portugal's former telecom monopoly PT Portugal, its latest bet on the convergence of cable with mobile.

BT had previously been looking at both EE and O2, the British mobile operator owned by Spain's Telefonica SA. By deciding to go for EE, BT opted for a deal that could be more complex to execute. But it also gives it access to a larger mobile footprint.

The U.K. market is dominated by four big players, EE, O2, Vodafone PLC and Hutchison Whampoa Ltd.'s Three. Vodafone, Hutchison Whampoa and Sky PLC are exploring what moves they may take in the shifting market, according to people familiar with the matter.

Philip Lawlor, chief investment strategist at Smith & Williamson, said the talks were "yet another sign that M&A activity in Europe is on the steep upward incline."

A deal would bring BT over 30 million customers, 580 retail stores and about 15,000 new employees. It would also give it a sprawling 4G network that currently covers some 75% of the U.K. population. Vodafone and other competitors have been racing to roll out and upgrade 4G, a faster network that can better cater to the increasing amount of content, such as video, that customers are asking for.

But a deal to buy EE would also leave BT with two minority shareholders. EE's German and French telecoms operators, which each hold an equal 50% share in EE, have been looking for a way out of their joint venture for some time. Early this year, the two companies abandoned the idea of a possible listing of EE, and Orange Chief Executive Stephane Richard said in November that the 50-50 structure wasn't a viable solution for the long term.

Discussions about the future of EE between the two partners picked up in recent months, according to people familiar with the matter.

By agreeing to a lower stake, Orange will take away more cash from the transaction. According to a person familiar with the matter, Orange could walk away with around GBP3.7 billion under terms of the current proposal.

BT didn't detail the cash portion of the proposal, but said in a statement it is "mindful of the importance of maintaining a conservative financial profile."

Shares in BT were closed at the time of the announcement, having risen a little under 0.2% Monday. Year-to-date they are up by 4.9%, outperforming London's FTSE 100 index, which has fallen 8.4% so far this year and fell 1.9% on Monday. Shares in Deutsche Telekom and Orange ended the session down 1.8% and 2.2%, respectively.

The announcement by BT comes after weeks of discussions with both EE and O2. O2 was seen by many as a front-runner because it was smaller, and theoretically an easier deal to negotiate because of its single owner.

BT's decision to pick EE, not O2, for exclusive talks leaves Telefónica in the lurch. A deal for O2 would have allowed Telefónica to free up cash for investments in markets where it is seen to have a stronger competitive position, such as Latin America. O2, which analysts value at roughly $14 billion, has over 24 million customers. A Telefónica spokesman declined to comment on BT's decision to begin exclusive talks with EE.

For Orange, the deal would free up more cash as the company looks to consolidate its position elsewhere. The former French monopoly in September offered EUR3.33 billion ($4.14 billion) to buy Spanish telecom company Jazztel. The company has also said it is eager to consolidate its position in other markets such as Romania, Belgium and Slovakia.

Josie Cox

and Christopher Bjork contributed to this article.

Write to Shayndi Raice at shayndi.raice@wsj.com and Ruth Bender at Ruth.Bender@wsj.com

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