J12 1080P Mini Projector Outdoor Movie Projector 100" Projector Screen, Work with TV Stick Video Games HDMI USB TF VGA AUX AV EU Standard

SKU: GW49.0001EU

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Something similar happened to me. I’ve only connected to my iPad, but when I first did, couldn’t hear a thing. Simply enough, I used the projector remote to adjust the volume which was on zero. Most likely, you’ve tried this, but just in case, worth a shot! 
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The projector comes with an aux port it's the first porting on the front right hand side that can be hooked up to a speaker or a bluetooth receiver. 
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If you are not getting a picture what so ever from your phone its most likely the cable you are using to go from your phone to projector would recommend getting the apple certified lightning to hdmi 
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Yes but need an adapter that is not included but offered as a free gift for honest review of product. I used a fire stick and the pic was amazing. 
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No there’s not