A study conducted by ad network Chitka found that Research in Motion's (RIM) handsets saw a 25% slump in mobile traffic between September 2011 and July 2012.
RIM has endured a tough year, losing ground on competitors such as Apple and Samsung thanks to a reputation-damaging service blackout, lacklustre sales of its PlayBook, and below-par fiscal results.
"A widely shared belief is that RIM's lacklustre response to the iPhone was a critical mistake that cost BlackBerry its top market position late last decade," said a Chitka analyst.
The latest traffic figures have also been attributed to the company's transitional state as it prepares to launch its BlackBerry 10 platform, considered by some as the firm's latest chance at sustaining profit in the consumer market.
The first BlackBerry 10 handsets are scheduled for release in early 2013.