When enabled, if you receive a busy signal, the service keeps trying the called number. Once the called party’s phone goes on hook, you receive a special ring tone and the called party’s phone is automatically called back.

To enable:

      1. After calling a party and receiving a busy tone, dial *66 and wait for confirmation announcement.
      2. Hang up.
      3. When called number goes on-hook, your phone will ring a special tone to signal that the called party’s phone is being called back. The called party’s phone will ring as usual.

To disable: This feature is only enabled on a per call basis. No need to disable.