Drawing an iphone 4s in a squared notebook

All measurements are in squares

outer height 23
outer width 12
screen height 15 ( 4 from top )
screen width 10 ( 1 from left)
speaker height 1/5 ( 2 from top )
speaker width 2 ( 5 from left )
camera – draw circle 1 square to left of speaker
home button height 2 ( 1 from bottom )
home button width 2 ( 5 from left )

home button should be round
outer corners of phone should be 1 square of curve