Step 1: Materials & Tools
+ A clip (found in any office)
+ A ball of paper, if its tissue paper, better.(not pictured)
+ Tape (any kind will work)
+Clamps(sorry, its google traductor, i mean the tool that is used to twist the clip) (not pictured)Also, you could use pliers.
+Something that can draw on metal
Step 2: Twist the Clip
Twist the clip with the pliers or clamps until you get this form.The ruler is for measuring size of the parts, i chose 1cm for the short part, and the rest i made it by eye.
Also, twist the angle to your like.
Step 3: Tape It to Somewhere
Now, just tape the clip to anywhere you like then tape the ball of paper above the clip so that it acts as a paper ball (:P) that stops the phone from falling forward