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A view of the visitors at the Samsung stand during the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain, Tuesday, Feb. 26, 2013. (AP Photo/Manu Fernandez)

Visitors look at devices at the Accenture stand at the Mobile World Congress in Barcelona on February 26, 2013. The GSMA Mobile World Congress, representing the interests of the worldwide mobile communications industry, will take place from February 25 to 28 in Barcelona. REUTERS/Albert Gea

Attendees use their devices inside a pavilion of the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain on Tuesday, Feb. 26, 2013. (AP Photo/Emilio Morenatti)

Visitors walk past a poster, at the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain, Tuesday, Feb. 26, 2013. (AP Photo/Manu Fernandez)

Visitors rest at the Mobile World Congress, the world's largest mobile phone trade show in Barcelona, Spain on Tuesday, Feb. 26, 2013. (AP Photo/Manu Fernandez)

Visitors listen to Ericsson president and CEO Hans Vestberg at a press conference in Barcelona on February 25, 2013 on the first day of the Mobile World Congress. The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to 28 in Barcelona. JOSEP LAGO/AFP/Getty Images

Visitors walk during the the Mobile World Congress in Barcelona on February 26, 2013. The GSMA Mobile World Congress, representing the interests of the worldwide mobile communications industry, takes place from February 25 to 28 in Barcelona. REUTERS/Gustau Nacarino

A group of cyclists rides past the Mobile World Congress in Barcelona on February 24, 2013, a day before the start of the 2013 Mobile World Congress. The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to February 28 in Barcelona. LLUIS GENE/AFP/Getty Images

General view of the 2013 Mobile World Congress in Barcelona on February 24, 2013, a day before its start. The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to February 28 in Barcelona. LLUIS GENE/AFP/Getty Images

Workers from Spanish telecommunications company Telefonica, with bags over their heads, protest against job cuts at the entrance of the Mobile World Congress in Barcelona on February 25, 2013. The words on the bags read, "Yes, I'm profitable". REUTERS/Albert Gea

An attendee watches as demonstrators from the Telefonica phone company gather to protest against what they claim are unjustified dismissals from the company outside the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain on Monday, Feb. 25, 2013 (AP Photo/Emilio Morenatti)

Attendees use their devices inside a pavilion at the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain, Tuesday, Feb. 26, 2013. (AP Photo/Emilio Morenatti)

Visitors look at new Samsung devices during the first day of the Mobile World Congress 2013 at the Fira Gran Via complex on February 25, 2013 in Barcelona, Spain. The annual Mobile World Congress hosts some of the world's largest communication companies, with many unveiling their latest phones and gadgets. (Photo by David Ramos/Getty Images)

The new NEC dual screen phone is pictured during the Mobile World Congress in Barcelona, February 26, 2013. The GSMA Mobile World Congress, representing the interests of the worldwide mobile communications industry, takes place from February 25 to 28 in Barcelona. REUTERS/Gustau Nacarino

Visitors check smartphones at a Huawei stand in Barcelona on February 26, 2013, on the second day of the 2013 Mobile World Congress . The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to 28 in Barcelona. JOSEP LAGO/AFP/Getty Images

A hostess wearing a mobile phone costume walks at the 2013 Mobile World Congress in Barcelona on February 26, 2013. The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to 28 in Barcelona. JOSEP LAGO/AFP/Getty Images

A visitor talks on his mobile phone during the Mobile World Congress in Barcelona on February 26, 2013. The GSMA Mobile World Congress, representing the interests of the worldwide mobile communications industry, takes place from February 25 to 28 in Barcelona. REUTERS/Gustau Nacarino

A man speaks on his mobile phone at the 2013 Mobile World congress in Barcelona on February 25, 2013. The 2013 Mobile World Congress, the world's biggest mobile fair, is held from February 25 to 28 in Barcelona. JOSEP LAGO/AFP/Getty Images

Visitors are seen at the Ericsson stand at the Mobile World Congress, the world's largest mobile phone trade show, in Barcelona, Spain, Tuesday, Feb. 26, 2013. (AP Photo/Manu Fernandez)

A visitor checks his mobile phone as he walks past a Samsung stand during the first day of the Mobile World Congress 2013 at the Fira Gran Via complex on February 25, 2013 in Barcelona, Spain. The annual Mobile World Congress hosts some of the world's largest communication companies, with many unveiling their latest phones and gadgets. (Photo by David Ramos/Getty Images)