The arrangement of nearly 3,000 names at the World Trade Center memorial is now available as a free iPhone app.

The guide to the names was placed online in May. It will be available on electronic kiosks when the memorial opens next month, on the 10th anniversary of the Sept. 11 attacks. It includes biographical information about each of the victims.

The names are inscribed on bronze parapets where the towers once stood.

Also, memorial president Joe Daniels said a public-service announcement about the attacks will air on local TV stations starting today.