The number will not show up for that particular call) or
Not to disclose your number for a particular call (dial 133 before dialling the number you wish to call. But even if you have not subscribed to the service, when you use the same network to make a call, your telephone number will automatically be transmitted to the called party, unless you deliberately choose not to. For a network offering CND service, subscribing to the service allows you to know others' numbers when a call is received. Before buying or renting equipment, you are advised to test the equipment to ensure that it works, and that it has the functions and features you desire. Such equipment is available from a number of product suppliers, and you are NOT obliged to buy the product from your phone company or any particular retailer. You will also need to have equipment for display of the incoming number. There will probably be a subscription fee. You should apply directly to your phone company if it is offering CND. If there is no one home, your number and the time of your call may be recorded in the called party's CND equipment, making callback easier. In case your calls were interrupted, the other side would still know the number to call back. 
Your friends and relatives will enjoy the above benefits if they know it is you calling before they answer your call.
This will assist you in managing your personal communications more effectively and enhance your privacy.Most CND equipment has memory functions to store the number of incoming calls, together with the date and time.You may then decide whether to answer a particular call, or may choose to note down the number and return the call at a more convenient time.This service allows you to know the telephone number of incoming calls once the telephone starts to ring and before you answer the call.This leaflet will help you understand what CND is, and what you need to know to make the best use of this service.The first Calling Number Display (CND) service was introduced in Hong Kong for both fixed and mobile phones in late 1996.What you need to know about Calling Number Display Office of the Communications Authority - Information Leaflets (Record No.: 20) What You Need to Know about Calling Number Display
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