dDon't be addicted to your phone Don't be addicted to your phone

dDon't be addicted to phones Don't be addicted to phones

Since you're talking about phones in general here instead of one specific phone, it should be plural.

Recently i, I realized iI'm addicted to playing on/with my phone. Recently, I realized I'm addicted to playing on/with my phone.

*'I' is always capitalized

Recently i, I realized ithat I'm addicted to playing on my phone. Recently, I realized that I'm addicted to playing on my phone.

"I" is always capitalized. We "play" certain things, like instruments, directly (she plays guitar), but for phones or computers, you need to add "on"

Recently iI realized iI'm addicted to playing on my phone. Recently I realized I'm addicted to playing on my phone.

It would not be an exaggeration to say my phone has ruined my life. It would not be an exaggeration to say my phone has ruined my life.

It would not be an exaggeration to say my phone has ruined my life. It would not be an exaggeration to say my phone has ruined my life.

Or "... that phones have ruined my life" to speak generally about phones

It would not be an exaggeration to say my phone has ruined my life. It would not be an exaggeration to say my phone has ruined my life.

Since you're talking about your own phone, you should say "my phone." "Phone" by itself is unnatural. Singular nouns in English almost always need an article (a, the) or a pronoun (my, your, this, that, etc).

I think iI should urge myself to not to let phone distract me. I think I should urge myself to not let phone distract me.

I think iI should urgforce myself not to let phone distract me. I think I should force myself not to let phone distract me.

"Urge" is more like convincing yourself about something. Speaking as a matter of willpower, "force" is a little better

I think i should urge myselfneed to not let my phone distract me. or I've been trying not to let my phone distract me. I need to not let my phone distract me. or I've been trying not to let my phone distract me.

There's nothing wrong with your grammar here, but the sentence sounds a bit unnatural to me. In the sentence before, you say "My phone has ruined my life." That's a really strong statement. This sentence is a lot weaker. "I think" and "I should" both reduce the certainty of your statement, which doesn't match what you said in the sentence before.

My average screen time is about 8 hours, which is terrible, so it must be reduced. My average screen time is about 8 hours, which is terrible, so it must be reduced.

My average screen time is about 8 hours, which is terrible, so it must be reduced. My average screen time is about 8 hours, which is terrible, so it must be reduced.

My average screen time is about 8 hours which. This amount of screen time is terrible, so it must be reduced. My average screen time is about 8 hours. This amount of screen time is terrible, so it must be reduced.

If there is nothing to do，then I should either study or develop hobbies which isare better than grabbing my phone all the time. If there is nothing to do，then I should either study or develop hobbies which are better than grabbing my phone all the time.

If there is nothing to do，, then I can either study or developfind new hobbies, which isare better than grabbing my phone all the time. If there is nothing to do, then I can either study or find new hobbies, which are better than grabbing my phone all the time.

"Find a hobby" is very idiomatic

IfWhen there is nothing to do，then either, studying or developing hobbies which is better than grabbing my phone all the time. When there is nothing to do, studying or developing hobbies is better than grabbing my phone all the time.