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is scheduled to report fiscal first-quarter earnings Tuesday, and eyes will be focused on sales of each "iDevice," none more so than the iPhone, which is the single largest contributor to revenue.

Macs, iPods, and iPads contribute the majority of Apple's revenue when grouped together (59%), but Apple's largest revenue segment is the iPhone. The iPhone accounts for 41% of Apple's revenue, according to


As such, there is a heavy emphasis on the number of smartphones Apple sold in the quarter ended in December.

Strong iPhone sales have helped

component suppliers

such as


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Skyworks Solutions

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Tri-Quint Semiconductor


, as orders for the iconic smartphone continue to remain exceptionally strong.

Noted Apple bulls such as

Sterne Agee's

Shaw Wu and

Piper Jaffray's

Gene Munster expect 29.5 million and 30.6 million units to be sold, respectively.

Barclays Capital

analyst Ben Reitzes expects 30.8 million units sold.


analyst Walter Piecyk is the high mark on Wall Street with an estimate of 35 million units sold.

How many iPhones do you think were sold during the fiscal first quarter? The results will be published right after the close of trading Tuesday.

Interested in more on Apple? See TheStreet Ratings' report card for

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Written by Chris Ciaccia in New York

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