I found a few tutorials on making these very useful phone rests online and like the one on factotum of arts blog here. This one is quick and easy. All you need is one piece of fabric 9" X 12" - some rice or small beans to stuff inside for weight and a bit of fiberfil. Also a small, only 1" X 5" piece of heavy interfacing.
This is how to make them:
Sew along two of the raw edges with a 1/4" seam leaving a 2" opening about an inch from the folded edge.
Turn it around so the long seam is in the middle as shown.
On the bottom raw edge sew leaving another 2" opening about 1" from the edge.
Turn inside out thru one of the 2" openings.
Measure 3" up from the bottom, Mark a line and sew on that line. Cut a piece of heavy peltex or other extra heavy interfacing 1" by the width of your pillow. Insert the interfacing thru the bottom hole and fit it snug against the line you just sewed.
Sew along the bottom edge of the interfacing to secure.
Fill the bottom tightly with fiberfill and hand sew the opening shut.
Thru the other hole pour in rice or small dried beans - fill about 2/3 with them. I made a funnel out of some light weight cardboard to make it easier.
Fill the rest with the fiberfill, making sure the rice is on the bottom. Fill tightly until it sits up the way you want it. Then hand sew the opening shut.
Make a bunch of them to put in every room so you won't loose your phone. Set it by your sewing machine to watch a video or chat with a friend. They make great gifts as well.