Why has the sound on my iphone 4s stopped working if I don't have earphones in?

This morning I was playing music off my iphone (without earphones) and it was working fine, but after that I was outside in the rain for the day but it was in my pocket for most of the day. I tried to make a phone call and I couldn't hear them but they were able to hear me, and I realized I can only hear them with speaker on. My phone is on full volume & isn't on mute. It won't play music anymore either or any keypad sounds unless I have my earphones in. I have tried putting a cotton bud into the earphone bit in case there was any dust in there but that didn't help, I also got told to use dust remover but I'm too afraid to spray that directly into it? I also restarted my phone which didn't help it either.

My iPad done the same thing check in settings it set to lock rotation an not mute just once more. Then ask Siri to play music. It worked for me

Speaker might have blown. Don't know. Possibility.

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