The exact location of the add call button on an Android device may vary depending on the version of Android and the device itself. However, in general, you can follow these steps to make a new call on an Android device:
1. Open the Phone app on your Android device.
2. At the bottom of the screen, you should see a green phone icon with a white "+" sign in the middle. This is the add call button.
3. Tap on the add call button, and a new screen will appear with the phone keypad.
4. You can now enter the phone number you want to call or choose a contact from your address book.
If you don't see the add call button in the Phone app, it's possible that your device uses a different interface for placing calls. In that case, you may want to consult the user manual or online support resources for your particular device.