If you’ve been using cellular phone since at least the 90s, will likely have run into a situation where you hear a cellphone ring and you automatically reach for your handset, only to find that it wasn’t you being called but some other person. Pretty embarrassing, isn’t it? Now customized  cellular phone ringtones  have largely solved this problem by allowing anyone to have tone that is more or less uniquely theirs. They can be fun as well as useful and as a result, they are quite popular. The industry that distributes cellular phone ringtones is now worth billions of dollars as a result.