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phone thinks theres a headphone plug on the phone. when i get incoming call no sound except when i plug in a headphone. same when i want to listen to music. I already changed the headphone jack but still not working.. I reboot, reset did everything.. nothing works.. any suggestion what i need to replace. I have a 3g firmware 5.12.01

Honestly, it sounds like the speakers blew. Here’s how to replace them. Either that or the earpiece speaker is shot.