I have an Infinix phone (Infinix Hot 4 or Zero) which seems to be consuming more internet than needed. If I play a video in 1080p on my iPhone and then play the same video in 1080p on my computer, both run perfectly, no buffer. But if I do the same replacing the iPhone with the infinix, the computer video buffers a lot! I cannot seem to find out why. Please help.
If both are on the same WiFi, it could be that the phone just has a bad WiFi chip and drivers that is not setup well. WiFi is a shared connection, if something is causing issues on the signal it will affect things. You said "same video", have you tested the connection speeds in general? Try using the phones and then run a speed test on the laptop, see if there is a difference there between the phones then.
The thing is, I usually play online games, and as long as that phone isn't being used, everything works perfectly. But as soon as you use YouTube on that device or stream any video at all, it just sucks up all the internet.