egrips 1.6 x 2.3 in U.S. Flag Anti-Slip Sticker - Universal Grip Sticker for Mobile Cell Phone, Remote Control, Powerbank, Handheld Device & more - Cleanly Removable Adhesive Adhesive 2Pack

I've had these before and the best thing ever for when you leave your phone on the dash or anywhere similar

Bought this product to put on my clear speck phone case because it is really slippery. Put this product on and now my phone in its case will sit on dash board while driving down the road.