Home button fell off, need to know what to replace

"If the only thing that fell off is the plastic button cover, then that is the only thing that needs to be replaced unless the actual button connected to the ribbon does not work. If the actual button on the ribbon cable is not working, that will have to be replaced as well. Here is a guide with instructions on replacing the plastic button cover: iPhone 5 Home Button Replacement

And here is the part:

[linked product missing or disabled: IF118-008-1]"

"If your home button is like mine and falling ,but not yet fallen out, it's quite annoying isn't it! But if you don't want to pull out your home button to replace it, you could just go on settings the on accessibility then click on assistive touch turn it on and a small button should pop up on your screen that you can move round. That's a home button! You can use it as a normal home button, but personly I find it a bit better than a normal home button... hope this helps!

P.S this is what I did and it helped!!"

settings, > accessibility > assistive touch