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