If my phone won’t turn on does it need a replacement battery?
If my phone won’t turn on does it need a replacement battery or is broken?
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If you already tried the Related Article…
If your iPhone, iPad, or iPod touch won't turn on or is frozen
Then arrange a repair to find out what the problem is.
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.