Allows your phone to keep trying a busy number up to 30 minutes. When the called party's line clears, Automatic Callback signals you with a special ring and automatically places the call when you pick up the phone.
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How to use Automatic Callback:
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When you hear a busy signal, hang up. Lift the handset and listen for a normal dial tone.
Press (On a rotary phone, dial 1166)
If the line is still busy, hang up. Your phone will check the number for up to 30 minutes.
A special callback ring alerts you if the line becomes free. (Some phones ring normally.) Lift the handset or receiver to automatically place the call.**
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To cancel your Automatic Callback request:
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Lift the handset and listen for normal dial tone.
Press (On a rotary phone, dial 1186)
Listen for the confirmation announcement. Hang up.
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To cancel your Automatic Recall request:
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Press (On a rotary phone, dial 1189)
Listen for the confirmation announcement. Hang up.
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Notes:
To start the 30-minute clock, repeat steps 1-3 under "How to use."
You can program multiple numbers, but you will not know which call is ringing you back unless you have a Caller ID feature.
If you cancel an Automatic Callback request, it will cancel all the Automatic Callback numbers programmed.
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This feature works with most calls placed within the local and regional calling areas.
Looking for 
(On a rotary phone, dial 1189)