Call waiting and call hold are used together. If you receive an incoming call while you're already on the phone, you'll hear a tone letting you know another call is coming in. If you answer the incoming call, the first call will automatically be placed on hold. You can then switch between the calls, or join the calls together using conference calling.
For Pay in Advance (Prepaid) plans, minutes are deducted for each incoming call when using call waiting.
About caller ID
About call forwarding
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