T-Mobile’s “2009 Grammy Celebration Tour” has announced most of its headliners, including Leona Lewis (April 9 at the Hollywood Palladium), Katy Perry (May 13 at the Jackie Gleason Theater in Miami) and LL Cool J (May 28 at Terminal 5 in New York City). The bills for Boston (April 28 at the House of Blues) and San Francisco (April 14 at the Warfield) haven’t been confirmed yet.

Select T-Mobile locations will offer a limited number of giveaway tickets to each event. Aside from that, the company’s Sidekick phone will support the tour through an extensive marketing campaign and tie-ins at Sidekick.com.

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