Tracfone LG840G lost all sound. Why?

Is there a chance the phone is thinking that it has headphones plugged into it? Try plugging some in and then unplugging them. Component replacement is possible, but with a cheap phone possibly not worth it. Local repair shops may say not worth it.

I plugged a set of headphones in and now the sound is working again, it had the little headphones icon on top ,which it just randomly came on .

why does the sound go in & out while I’m talking