How to turn on my iphone that I haven't used in awhile?

I try plugging it into the charger and nothing happens.

I'd try a new battery first- and then a new charge cord. If those things don't work- it's a brick- notta phone

First plug it in, wait a few hours, sometimes even a day or two, then hold down the top button

Your battery probably died, so when you probably plug it into the charger, sometimes it can take a long while before you can turn it on again

Change battery if that doesn't work change charger.

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