Hand-made mobile phone bracket

Find six business cards, two in each pair (for strength), and then nail them together. If there are plastic cards, three will do.

Find a business card and a half, fold it into three equal parts and make a triangle.

Paste it into strips, as shown in the figure.

Side view. The triangle is specially attached, not integrated. The distance between the big triangle and the small triangle should be moderate, too big and too loose, too small to fit in.

It's done.