I'm assuming there is no Apple Care on it anymore?
You're honestly better off buying a new and probably more up to date iPhone. If not, there is a website called IFixIt. Maybe give them a look? Not sure on their prices though.
Here's my most recent portfolio. Soup's Portfolio
Would have made it on BeHance but I don't think it's the most proper graphics to actively promote on such a portfolio website, lol.
Gradient overlay (you can either use the black and white default one and change the blending mode to something like "Overlay" or whatever or you can set the colors)
Then add an inner shadow (1px white color dodge usually and mess with opacity)
Add a stroke (usually the a darker color of the one...