How can you make a voice call using WhatsApp?

To make a voice call using WhatsApp, follow these steps:

1. **Open WhatsApp**: Launch the WhatsApp application on your smartphone.

2. **Navigate to Contact**: Go to the chat screen of the contact you want to call. You can do this by searching for the contact in the "Chats" tab or through the "Contacts" tab.

3. **Initiate Call**:
   - **Android**: Tap on the phone icon at the top right corner of the chat screen.
   - **iOS**: Tap on the phone icon at the top right corner of the chat screen or tap on the contact's name at the top of the chat and then tap on "Voice Call" from the options that appear.

4. **Wait for Connection**: WhatsApp will initiate the call. Wait for the recipient to answer.

5. **During the Call**:
   - You can mute your microphone by tapping the microphone icon.
   - You can switch to a video call by tapping the video camera icon if both parties have video calling capabilities.

6. **End Call**: To end the call, tap the red phone icon.

WhatsApp voice calls use your internet connection (either cellular data or Wi-Fi), so it's important to have a stable internet connection for the call quality. Additionally, WhatsApp calls are free, but data charges may apply depending on your internet plan.