ringtone or Ringback?
Ringtones are downloaded to and played by your phone. You'll hear a ringtone when someone calls you, provided your phone isn't set to vibrate or silent.
Ringback Tones aren't downloaded to your phone. Instead, the Ringback Tone is played by our network to your callers before you answer the call or the caller is diverted to voicemail. The person calling you hears the Ringback Tone.