Listen for a dial tone, then press *69; you’ll hear a message giving you the time, date, and number of the last call. Press 1 to dial the number, or hang up if you do not wish to return the call.
If you choose 1 to connect and get a busy, hang up and your phone will continue to try the number for up to 30 minutes. When a connection is made you’ll be alerted by a special ring, just pick up the receiver. Use *89 to cancel any time before the call connects.