Apple (AAPL) - Get Report is slated to report earnings after the close of trading on Tuesday, and Wall Street isn't expecting much from the world's most valuable company by market capitalization.

Almost all of the analysts on Wall Street who cover Apple -- including ones who are super bullish, like Morgan Stanley's Katy Huberty, Piper Jaffray's Gene Munster and others -- cut their estimates for iPhone shipments this quarter, on concerns the iPhone 6s and iPhone 6s Plus are not selling well because of a perceived lack of a reason to upgrade.

Whether it's the lack of a "killer feature," the company's advertising campaign or smartphone fatigue, it appears consumers are not upgrading to the iPhone 6s and iPhone 6s Plus in as great numbers as they did to the iPhone 6 and 6 Plus.

Analysts surveyed by Thomson Reuters expect the company to earn $3.23 a share on $76.6 billion in revenue for the fiscal first quarter.

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