How to register vivo account?
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？
What features does Ultra Game mode include on V21e?
What should I do if I forgot the password of my vivo account?
How to find my phone?
Does V21e support 4K video？
Does V21 support display real-time network speed on the status bar?