• Choose a Song Anyone Can Enjoy
  I know it is unfair and not cool at all to make your phone ringtone sound the way most people like but just once in a lifetime think of this idea and let people understand how much you love them. 
• Avoid Swearing in Ringtones
  Even if it sounds great and even if it is the hottest song ever – you will look really odd and most people will develop negative opinions about your choice in music.
• Avoid “Hot” Songs as Your Ringtone
  It’s no use to make your ringtone a song that currently occupies the highest positions in all charts. First of all, it will make people think that the only one thing you care of in your life is fashion and then it can be in a black list of your colleagues or friends.
• Think of a Ballad as Your Ringtone
  Think of a ballad, such a ringtone will send a positive message and your phone will sound nice and pleasant.

And always remember, no matter how cool and positive your ringtone is, there are some places where you should switch your phone off or turn it on silent or on vibrate.