There are plenty of decent guitar apps on the market that can help you practice and take your game to the next level. The AcousticK can make your life even easier. It is a smartphone holder that lets you mount your iPhone to your acoustic guitar. It is designed to adapt to any kind of guitar body shape.
The AcousticK can hold smartphones up to 6″. It comes with anti-slip gums with adjustable spring. You can adjust it for the perfect view. The AcousticK also has a clip to hold a pick.[where to find it]