Quick Dial allows you to make calls with the screen off without navigating to the main interface.
Quick Dial on Huawei Y7 Prime screen-off works as follows:
Step 1: Go to 'Settings' and select 'Smart Assistance'.

Select 'Smart Assistance'.
Step 2: Choose 'Voice Control'.

Choose 'Voice Control'.
Step 3: Select 'Quick Dial'.

Choose 'Quick Dial'.
Step 4: Turn on 'Quick Dial'.

Turn on 'Quick Dial'.
Note: The device doesn't support Vietnamese language, so the result when speaking contact names may be inaccurate.
Congratulations! You've successfully completed the setup process. Wishing you all the best.