IPhone broke won't turn on what should I do?

Hi, one of my friends gave me their old iPhone 3GS after they got an upgrade and its about 5 months after I got it, it broke yesterday what should I do?

Added (1). It turns on just the screen doesn't work neither does the digitizer

Take it to an Apple store.

Hold power & home button for 15 seconds, if you see the Apple logo, you don't need to worry that's only because your iPhone got crashed, if it stays turned off then you should take it to the Apple store.

Sell it for spares or repairs and use the money to buy another one.

iP3s are unsupported now and so cost peanuts and there are millions of perfectly functional used ones for sale. Any repairs to yours will not be cost effective unless you're able to work out what's wrong for yourself and replace whatever's broken. But diagnosing anything but really obvious faults on dead devices is difficult without special tools and skills.

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