BlackBerry users may be ready to move on to other smartphone platforms, suggesting that RIM isn't keeping up with consumer demand in its efforts to combat growing encroachment from the likes of iPhone and Android. In fact, two in five BlackBerry owners plan to swap their current device for an iPhone when it's time to upgrade, according to market researcher firm Crowd Science.

The iPhone has had a lasting effect on the smartphone market, changing the conception of what a smartphone should be almost overnight after the launch of the original iPhone in 2007. Despite RIM's entrenchment among business users, however, the iPhone platform has grown at a faster rate than the BlackBerry over the last year.

Perhaps the trend can be explained by Crowd Science's findings that many are using their smartphones for both personal and business use. Nearly a third of iPhone owners use their device for strictly personal use, versus just 16 percent for BlackBerry users. Just one percent of iPhone owners use their device for business only—no surprise there—so two-thirds are using an iPhone for business and personal use. And, while the BlackBerry has a reputation as the best enterprise mobile device, a scant seven percent of BlackBerrys users dedicate the device to business use only. That leaves over three-quarters of BlackBerry owners using their device for dual purposes.

The iPhone isn't the only platform attracting the attention of BlackBerry users, though. Interest in Android-based devices has grown since the introduction of Google's Nexus One, with 32 percent of BlackBerry users surveyed saying they would swap their current device for a Nexus One.

"These results show that the restlessness of BlackBerry users with their current brand hasn't just been driven by the allure of iPhone," John Martin, CEO of Crowd Science, said in a statement. "Rather, BlackBerry as a brand just isn't garnering the loyalty seen with other mobile operating systems."

About 90 percent of current iPhone and Android users plan to stick with their current platform for their next phone upgrade.