I always carry withmy smartphone (with me). I always carry my smartphone (with me).

Or "I always take my smartphone with me (when I leave the house)."

I always carry withtake my smartphone with me. I always take my smartphone with me.

I always carry witha smartphone with me. I always carry a smartphone with me.

I always carry with smartphone. I always carry with smartphone.

I always carry my smartphone.

I always carry withmy smartphone. I always carry my smartphone.

"I always carry a smartphone." also works.

I use my smartphone every day. I use my smartphone every day.

I use my smartphone every day. I use my smartphone every day.

I use my smartphone every day. I use my smartphone every day.

I use smartphone every day. I use smartphone every day.

I use my phone everyday.

I use my smartphone every day. I use my smartphone every day.

"I use a smartphone every day."

I often watch yYoutTube videos. I often watch YouTube videos.

I often watch youtube videos. I often watch youtube videos.

It's multiple videos so I added the s to make it plural.

I often watch yYoutube videos. I often watch Youtube videos.

I often watch youtube video. I often watch youtube video.

I often watch youtube.

I often watch youtube videos on it. I often watch youtube videos on it.

I assume you mean that you watch youtube videos on your phone, in which case adding "on it" sounds more natural than leaving it out.

I like MV and gaming videos. I like MV and gaming videos.

MV = music videos?

I like MVs and gaming videos. I like MVs and gaming videos.

It's multiple of them so I added the 's' to make it plural.

I like MV and gaming video. I like MV and gaming video.

すごい🙂‍↕️

I like MV and gaming video. I like MV and gaming video.

I like MV and gaming videos.

I like MV and gaming videos. I like MV and gaming videos.

What does "MV" stand for? I'm curious.

No smartphone, no life. No smartphone, no life.

No smartphone, no life. No smartphone, no life.

No smartphone; no life. No smartphone; no life.