To make a phone call using the Huawei smartphone's phone app, simply open the app, enter the phone number in the dialing field and tap the green handset icon.

Android 10 | EMUI 10.0
Step 1:  Open the  Phone app
Step 2:  Enter a  phone number
Step 3:  Tap on the  green phone icon
  1. Open the Phone app
  2. Enter a phone number
  3. Tap on the green phone icon

Huawei Instructions