TAMPA, Fla.--(BUSINESS WIRE)--Syniverse Holdings will report its first quarter 2015 results on May 12 and will host a conference call on May 13 at 11 a.m. ET to discuss the first quarter financial results. The Quarterly Report on Form 10-Q, including unaudited, condensed consolidated financial statements for the quarter-ended March 31, 2015, will be filed with the U.S. Securities and Exchange Commission and posted on the company website at www.syniverse.com in the Investor Relations section und