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I’d like to change them istead of using headphones, can I do so myself and if not any idea how much it will cost ?
Hello supposing you are talking about the loud speaker? Yes you can do it your self! id suggest its is easy to moderate in difficulty you can follow this guide for the micro usb port , follow up to step 5 OnePlus One Micro USB Port Replacement the cost of the speaker assembly is around $10-20