When a girl addicted to her phone learns that the phone also is addicted to her and won’t let her go, she must find a way to get rid of it before it destroys all aspects of her life. Be it personal, professional, financial, social, physical and spiritual. All aspects are affected.

There's a post and reply somewhere on this site about that formula and why it fails to be compelling -- but also, every story starts when something happens...that's a given. It's a useless word where every syllable matters.

Don't use "When" at the start? I'll try it too

Always limit a logline to once sentence, 25-30 words, without commas when appropriate. Include the protagonist, antagonist, conflict, and stakes. Try to end on the hook, the inherent irony, so people think "Oh that's interesting..." If they like the logline, they want to read more. Additional detail belongs in a summary, synopsis, or treatment they can then request.

And never start with "When," despite the popular formula. People react to people, not events -- tell them who the main character is and what that person struggles with in the story. That's the draw of the movie.

It's also good to convey the genre and tone, so folks know what kind of story it is. Comedy and tragedy have the same dramatic elements, but they don't play the same -- be sure your readers know what kind of script they're in for.
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A teenage girl must break her smartphone addiction before it destroys her life, once the advanced device becomes emotionally attached to her as well.