After the first iPhone’s launch in 2007, it took less than three years for it to become Apple's most important product in terms of revenue. For the past five years, the iPhone has accounted for around 60 percent of the company's net sales, with its importance peaking in Q1 2018 at 70 percent, shortly after the iPhone X was launched. In the past quarter, however, as iPhone sales dropped from $29.47 billion to $25.99 billion while Apple's other segments all performed strongly, the iPhone's share of total revenue dropped below 50 percent for the first time since 2012.
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Source: Statista