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As Cupertino, Calif.-based Apple (AAPL) - Get Free Report reports fiscal first quarter earnings, all eye will be on the company's main revenue driver: the iPhone.

The iPhone accounted for 63% of Apple's revenue in fiscal 2016 (ended last September), and an even bigger share of its gross profit. And iPhone sales tend to claim an especially large revenue share in the pivotal December quarter, particularly in years when new iPhone launches involve a number change.

Eric Jhonsa, TheStreet's tech columnist, Scott Berman, an analyst with Jim Cramer's Action Alerts PLUS Charitable portfolio, and Leon Lazaroff, TheStreet's media and technology reporter, will be live blogging the company's earnings, providing instant reactions to Apple's quarterly report. The company's earnings call is at 5:00 p.m. ET.