Apple's not selling as many iPhones as it used to

iPhone sales aren't as hot as they used to be.
The company announced its Q1 2018 earnings on Thursday and — surprise, surprise! — it set another all-time quarterly revenue record, bolstered by iPhone sales.
Total revenue this past quarter increased to $88.3 billion from $78.4 billion, a 12.63 percent increase year-over-year. But while revenue increased, iPhone sales dropped.
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Though the company doesn't break unit out