By Frances Robinson and Vanessa Mock 

BRUSSELS--A questionnaire being sent to telecoms companies by the European Union's competition authorities suggests they are examining network-sharing agreements, the allocation of radio bands for the rollout of mobile 4G and entry barriers to the German market as they consider the proposed merger between Telefónica Deutschland AG and the German unit of Royal KPN Mobile NV.

The questions indicate that the European Commission is considering whether to make the parties dispose of key radio spectrum to gain regulatory approval for their EUR8.55 billion merger ($11.69 billion).

The high-profile deal, announced last July, would create Germany's largest wireless carrier by customers, creating an entity of a similar size to the local units of Deutsche Telekom AG and Vodafone Group PLC.

The confidential questionnaire, which has been seen by The Wall Street Journal, finds the commission asking about competition and pricing in both the retail and wholesale mobile market in Germany.

It also seeks to find out how the deal would affect frequency allocation in Germany, and whether it would be possible to roll out a 4G network on either the 800 MHz or 1800 MHz radio band. Radio waves of different frequencies are used for everything from television signals to ambulance radios, with bands used for mobile broadband the most valuable asset for a wireless operator.

The questionnaire reflects earlier commission worries about the merger's impact on the German wireless market, and doesn't focus on any single, specific area of concern.

The merger is being closely watched as it would see the number of operators fall from four to three in Germany, whose wireless market is worth around EUR22 billion.

It would see Telefónica and E-Plus, KPN's German unit, command a large slice of the spectrum, allowing them to boost the volume of calls and data traffic.

The review is seen as a key litmus test for further consolidation in Europe's fragmented telecoms sector. After years of economic strain thanks to Europe's deep recession, telecoms operators are looking to consolidate to achieve economies of scale. Leading operators have called on the commission to relax the EU's merger control rules, amid concerns that the regulatory process impedes major deal making.

The EU's antitrust watchdog routinely sends out questionnaires to rivals and third-parties as part of its in-depth review of a merger. Respondents are expected to reply to the seven-page form by the end of this week, one person familiar with the situation said.

The EU's antitrust chief, Joaquín Almunia, said last year he was concerned the transaction would "remove an important competitive force" and would change the merged entity's incentive to exert significant competitive pressure.

"Anyone watching this deal would expect the two operators to have to give up some spectrum, as a way of addressing concerns about competition and pricing. Regulators are also likely duty bound to make enquiries as to whether the same benefits could be achieved through network sharing, rather than a full merger," said Sam McHugh, senior research associate at Sanford C. Bernstein, an investment research firm in London.

Mr. McHugh points to Hutchison Whampoa Ltd.'s EUR1.3 billion purchase of wireless carrier Orange Austria, which was cleared by the commission in December 2012 after the Hong-Kong based firm agreed to divest radio spectrum and offer network access to new rivals. Similar to Germany, the number of operators in Austria also fell from four to three on the back of the deal.

Freenet AG's Mobilcom-Debitel and Drillisch AG already use the E-Plus and Telefónica networks, but the commission said last year it wanted to ensure that other so-called mobile virtual network operators also continued to have access to bandwidth.

"Prospective and existing MVNOs and service providers would have less choice of host networks and hence weaker negotiating power to obtain favorable wholesale access terms," it said last year.

The commission launched an in-depth probe into the deal on Dec. 20, and has until May 14 to make a decision. Germany's competition watchdog had sought to review the deal itself, arguing it affected only the national market, a demand rejected by the commission.

The opening of an in-depth inquiry doesn't prejudge the outcome of an investigation.

Write to Frances Robinson at frances.robinson@wsj.com and Vanessa Mock at vanessa.mock@wsj.com

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