Here's the number everybody will be waiting for on Apple's earnings call tomorrow

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Tomorrow, Apple reports earnings for its fiscal fourth quarter, which ended Sept. 30.

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As usual, everybody's eyes will be focused on the number that matters most to Apple's business: iPhone sales. The iPhone has become Apple's most important business, making up between 60% and 70% of its revenue in each of the last three quarters, and sales are still growing.

This chart from Statista shows quarterly sales since the iPhone first went on sale.

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The new iPhone 6S went on sale in the U.S., U.K., and a dozen other countries right at the end of the quarter. This quarter, average analyst estimates are around 49 million, which would be a 25% jump over a year ago. The high-end estimates are around 50 million, while 47 million or less would be a bad miss. But the most important quarter will be the end-of-year quarter - that's when we'll see whether the 6S can help break the year-ago's quarterly sales record of 74.47 million.

Apple iphone sales by quarter REVISED

Statista

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