Two ways to make inexpensive speaker for your iphone
Place it in a bowl:
Toilet Paper Roll:
Cut into a toilet paper roll, make it big enough to fit your phone, use push pins to hold up on either end. Then and place the phone into it. It really does work. I wish I could show you, but you'll have to just try yourself. I didn't even have the volume up high and it came out perfectly.
Place your phone in a ziploc bag when going near the pool or at the beach. You are still able to turn it on,text and take pictures. It will keep the sand away ( I can't tell you how many times I've killed electronics from that)