1. To activate Siri, either say "Hey Siri" or long-press the power button on your device.
2. Instruct Siri to "Send a message to (contact name)."
3. A drop-down menu will appear, displaying various apps; choose WhatsApp or your preferred messaging app.
4. Siri will open a message box with the selected contact name, ready for your input.
5. Speak up the message you wish to send, and Siri will transcribe and send it for you.
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