It sticks directly to your phone with a strong, yet removable 3M adhesive and it supports any cell phone with a flat back. And since teens seem to veg better than any other Gift girl idea teen group, fuzzy socks will keep their toesies warm during said lounging. They can write and draw to remember their trips or use the pens and washi tape to stay organized and plan what they want to do on vacation. Now their lists are short, and more influenced by what their friends have and Gift girl idea teen they see on YouTube. Both of my girls and my two nieces love these Hydro Flask water bottles.