A tweet posted Tuesday to BlackBerry’s official account looked perfectly normal — except for the part that said “via Twitter for iPhone.”
The text, which reveals that the update was sent from an iPhone, a competitor, is not visible in Twitter’s main app but can be seen in others like TweetDeck and Tweetbot, The Vergereports.
The tweet, ironically, encouraged BlackBerry’s followers to download Twitter for Blackberry. It was deleted shortly after.
PHOTOS: The Rise of Mobile Phones from 1916 to Today
1916 A German field telephone station in the Aisne department of northern France during World War I.Paul Thompson—FPG/Getty Images1970
French singer and actor Johnny Hallyday in a scene from the film 'Point de Chute' (aka 'Falling Point').Keystone/Holton/Getty Images1980
An early mobile phone during the Iranian Embassy siege at Princes Gate in South Kensington, London.Kypros/Getty Images1983
Bob Maxwell, general manager of Englewood-based Mobile Telephone of Colorado, places a call on an FCC-approved radio frequency while driving to work.Lyn Alweis—Denver Post/Getty Images1986
THE A-TEAM "The Say U.N.C.L.E. Affair" Episode 5. (l-r) Eddie Velez as Frankie Santana, Robert Vaughn as General Hunt Stockwell, George Peppard as John 'Hannibal' Smith.Bill Dow—NBC/Getty Images1992
Democratic presidential nominee Bill Clinton talks on a cell phone while meeting with Boston Mayor Ray Flynn in a New York hotel on Sept. 25.Mark Lennihan—AP1993
Whoopi Goldberg during ShoWest in Las Vegas.Jeff Kravitz—FilmMagic/Getty Images1997
A farmer with his family sitting on a Bullock Cart and talking on a mobile Phone, in Delhi.India Today Group/Getty Images2001
A woman watches smoke pour out of the World Trade Center Towers in New York on September 11.Nicholas Goldberg—Gamma-Rapho/Getty Images2011
A rebel militiaman speaks on his mobile phone after capturing territory from government troops on March 25 in Ben Jawat, Libya. John Moore—Getty Images2011
A youth films the aftermath of tear gas police fired at protestors in Muhammed Mahmoud Street near Tahrir Square on November 23 in Cairo.Peter Macdiarmid—Getty Images2012
Audience members take pictures of President Barack Obama at Florida Atlantic University on April 10 in Boca Raton, Florida. Marc Serota—Getty Images2014
A teenager takes a selfie in front of Queen Elizabeth II during a walk around St. Georges Market in Belfast. The Queen has apparently voiced her dismay that when she carries out engagements she is greeted by a sea of mobile phones.Peter Macdiarmid—PA Wire/Press Association Images/AP