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There are two different systems for sending the telephone number of the calling party down the line to the destination. One is Caller ID, which is suppressed by dialing *67 (or equivalently 1167) in North America (USA, Canada, etc.). The other is a system called Automatic Number Identification or ANI. You cannot suppress delivery of your ANI. If you call a toll-free number, or in certain other cases, your ANI may be delivered in real time to the company you are calling.

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Q: Why company can see your phone number when you use the prefix 67 first?
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