I purchased this anti slip matt at a sale for 3 bucks.
Its purpose is to hold cell phones, glasses and other objects in your car and prevent them from going out of the window on sharp turns. Let’s try it out. Stick the pad to the surface, which in my case is a wooden tray. Put a smartphone atop of it. It really does hold the phone no matter what. The amazing thing is the phone surface is not sticky afterwards. The manual says you should rinse the matt in hot water every once in a while, and it will regain its properties. Some more on the price. It turns out the 3 bucks sale price was a hoax, and you can actually get this pad on Ebay for about half of that, shipping included. Tough luck.