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Sorry, but that is just not enough information in order for us to be able to assist you with a potential solution.
Writing an effective Apple Support Communities question - Apple Support Communities
For example, which exact model is your iPhone? Are the "iPhone headphones" the ones that came with this phone? Have you tried using these headphones with your brother's phone or some other audio device to verify that they work properly? What else have you tried to resolve this yourself?
Question: My iPhone doesn’t work properly...