What should I do if my phone lags or hangs sometimes?

How to take a portrait photo via rear camera?

What should I do if my device cannot be powered on?

What are the differences between V15 Pro & V15?

How to avoid my phone overheat?

Why can my phone be unlocked through Face Access when I wearing a mask?

How to make my phone last for longer time?

What are the differences between Funtouch OS 9.0 and Funtouch OS 4.5?

How to take clear photos?

How can I find my phone?