Home button for iphone fell out of iphone

I don't know how the button fell out!
How do I put it back in?

I accidentally dropped the iphone but there was no crack.
The button fell out.

The button can't fit back in the phone… It's too big on the bottom side and there are some black arms on each side.
Help?

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You require special tools that will be able to open the casing shells of the iPhone panel and put the button back on.

These tools are usually available at the Apple Store. They can do the repair for you for about $50 if you have AppleCare+ authorized with your device. If not, they will charge you a fee above that price.

Your best bet is to call Apple for technical support at 1-800-MY-APPLE

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