For easier access to Ringback Tones and other VAS services, just dial *143# on your mobile phone and select menu 7.
Just a reminder. Ringback subscriptions are auto-renewed. This means that once your subscription period expires, it will automatically re-subscribe to the service and charge you unless you opt out from the service. If your balance is insufficient during the renewal attempt, you wil not be charged, but will try to do so again the next day.