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Your smartphone is more of a collaborative effort than you think
No one company can do it all.
A lot of it is done in-house — Samsung designs its Galaxy phones and decides how everything is going to fit together then supplies a sort of framework for every piece, both hardware and software. A manufacturer that makes something as complicated as a phone usually isn't also in the business of designing, testing, authenticating, producing, and licensing network technology, for example. No matter if you use an iPhone or an Android phone, listening through a set of quality earbuds means Qualcomm, Sony, and other companies must be involved.
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