Apple already does the most end-to-end work of any company building smartphones. It has complete control over the physical design, codes all the software, and designs the CPU at the heart of every phone.
But it still relies heavily on outside companies to produce many of the critical components for its phones and laptops. That leads to differences in the quality of chips between different iPhones, and can also be a strategic problem when, say, one of your suppliers of baseband modems decides to sue you.
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