How to delete messages on my iphone 5c without having to go on it?

My iphone 5c has lines all over the screen and so isn't letting me use the screen. (if anyone knows how to get rid of these lines without having to take off the screen or anything please help!) how can I delete my messages without having to go on my phone? Can I use iTunes?

I think you'd have to reset your whole phone… I don't think there's a way to delete your messages unless you actually do it from your phone

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