My iPhone 6 plus screen cracked and bits were falling of the edges, went to my local phone shop, they said 350bht, hmmmm, OK.
Went back 30 minutes later, wow, looks like new. So how did they do it.
They had an incredibly thin tempered glass cover exactly same colour and shape with curved sides that has adhesive on it, it is expertly positioned on the existing screen/phone edges. You cannot see any difference and the screen is incredibly clear with no visible cracks. Highly recommended...