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How good is the iPhone? Demand for Apple's (Nasdaq: AAPL) iOS devices is rising faster than all other North American alternatives, a new ChangeWave Research report says. Of the 4,163 consumers surveyed, 48% said they planned to purchase an iPhone within the next 90 days.

Google's (Nasdaq: GOOG) Android operating system also fared well -- no surprises there -- with 32% gravitating toward the robot, while Research In Motion's (Nasdaq: RIMM) BlackBerry looked black and blue by comparison. Only 4% preferred RIM's technology, the lowest level in the history of the ChangeWave survey.

Interestingly, RIM wasn't the only iPhone casualty identified in the report; Motorola Mobility (NYSE: MMI) also lost ground. Only 8% planned to purchase a Moto handset in the next 90 days, down 4 percentage points from ChangeWave's March survey. Strong demand for the Verizon (NYSE: VZ) iPhone appears to be the cause, the research firm said in a press release. Add it all up, and it appears that analyst projections for 15 million to 17 millions iPhones sold during the last quarter may have been conservative.

Do you agree? Will Apple blow away estimates yet again when it reports tomorrow? Please vote in the poll below, and then leave a comment to tell us what you think is driving the iPhone's success.  You can also add Apple to your watchlist for up-to-date analysis as soon as it's published.

Fool contributorTim Beyers is a member of theMotley Fool Rule Breakers stock-picking team. He owned shares of Apple and Google at the time of publication. Check out Tim'sportfolio holdings andFoolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insightsdelivered directly to your RSS reader.

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