If grandma still doesn't know what call waiting is and you need to talk to her right away, follow these easy steps to interrupt calls. You'll later be charged a fee by your phone company, which likely will be somewhere between $5 and $10.
Interrupting a Call
Step 1
Hang up when you get a busy signal. You can interrupt a call only by contacting the operator.
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Step 2
Dial "0." Tell the operator that you have an emergency or that you need to interrupt a call. Give the operator the person's number.
Step 3
The operator will interrupt the other party's call and inform the person that you are trying to get through and to clear the line.
Step 4
Hang up, then again call the person you are trying to reach. If the person has disconnected from the other call as requested, you'll be able to get through.