This page shows the different variations of the Zakaz używania kijków do selfie from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
It's a rectangular smart phone in horizontal orientation with a picture of a woman displayed on the screen. Attached to the smart phone is a long stick coming out the bottom. The entire image has a angular strike-through going through it to indicate that selfie sticks are not allowed.