By Simon Zekaria 

BARCELONA-- Orange SA Thursday said EE, its U.K. mobile joint venture with Deutsche Telekom AG, isn't sustainable in its current form in the long term, casting fresh doubts over the future of Britain's biggest wireless operator.

The former French telecommunications monopoly and Germany's biggest telecom operator each hold an equal 50% stake in the business.

"The 50-50 situation isn't a long-term scheme," said Orange Chief Executive Stéphane Richard, speaking at the Morgan Stanley telecom, media and technology conference in Barcelona.

The mobile operator's parent companies were considering a listing of EE last year, valued at over GBP10 billion ($16.3 billion) by analysts, and launched internal discussions but came to the decision that the timing wasn't right.

"In the mid-term future, we will have to think with the Germans about the evolution of EE," he added, adding that "all options are open" including a public listing or a separate merger and acquisition deal.

The CEO warned a decision isn't imminent. "Don't expect anything spectacular in the short term."

Mr. Richard said Orange is happy about the performance of EE and it is a very attractive asset for both companies.

Still, EE faces a battle for subscribers in the U.K.'s telecom market, where it competes against Vodafone Group PLC, Telefónica SA 's O2 and Hutchison Whampoa Ltd.'s Three in wireless services.

Vodafone has recently moved to add new services to their U.K. offer, such as broadband Internet and television, as the mobile specialists seek bundled media to boost revenues and subscriber growth. EE has also moved to add TV to its offer.

"We have some strategic issues ahead of us," said Mr. Richard. "EE needs to be also in this convergent market in the future."

Formed in the U.K. after what was then France Télécom merged its Orange brand with Deutsche Telekom 's T-Mobile in 2010, EE formerly known as Everything Everywhere has more than 30 million customers across the group, including on EE, Orange and T-Mobile plans.

It launched the U.K.'s first so-called fourth-generation wireless network in October 2012 with initial coverage to 11 cities, and its 4G coverage today reaches 75% of the U.K. population.

After lagging behind U.S. counterparts for years, European telecom operators are investing to embrace 4G, otherwise called long-term-evolution wireless communication, which suits faster Internet surfing and video streaming for tablets and smartphones.

Mobile operators are investing to bolster spending on their networks which, they say, have suffered amid Europe's weak economy, stiff competition and heavy regulation.

Write to Simon Zekaria at simon.zekaria@wsj.com

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