Can I take selfie videos under Slow Mode via Front Camera on my V21e？
Which camera-pairing option of Double-View video mode does V21e support?
Does V21e support extended RAM？
Does V21e support 4K video？
What should I do if I forgot the password of my vivo account?
What features does Ultra Game mode include on V21e?
How to register vivo account?
How to find my phone?
Does V21 support display real-time network speed on the status bar?