Loading icon when games are switching scenes

i have a game where there is a menu, and a few buttons, when you tap one it brings you to a different level, the way i made it is it just loads a different scene, which may not be the best way, but i was just making the game casually and didnt really see myself release it. But now i am releasing it and when i put it on a phone it takes awhile to load a scene which didnt really suprise me. But my dad is an appp developer (not with unity) and he said that it is important for me to make a loading bar so people dont get frustrated and say the game freezes their phone. Is there like a way to put a spinning icon while its loading?

I’m not sure how to do this myself but heres some links to some other forum/answers pages about this

http://forum.unity3d.com/threads/adding-loading-screen-while-unity-is-getting-loaded.17298/

also a youtuber has a free assets for this - YouTube