Why won't my iphone 4 turn on? - 4

I just deleted an app that took up roughy half of my storage and i turned my phone off right after and turned it back on but now its been stuck on the black screen with the white apple logo. Why?

Try plugging in a charger, doing that will usually unfreeze it. If that doesn't work hold the home and lock button at the same time for about 5 seconds.

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