hello i have a iphone don't know what type it is just got it yesterday not really mine for a friend first when i got it screen on iphone disable now i get it to restore on itunes but now screen stuck on itunes sign please help what do i do now? want to jailbreak and unlock it

Zero useful details from you means we can't help you.

Download Tiny Umbrella The Firmware Umbrella - TinyUmbrella run it, connect your phone to your computer.

Reply with the details it provides, especially iOS version, baseband and baseband bootloader.
While you have TinyUmbrella running click "save SHSH" and report back what it managed to save (or not save)