Have an iphone 6 with a cracked screen. Was going for some sprint plan where I upgrade from a 16 gb ip6 to a 64 gb ip6s for $5 a month, sounded pretty good as I'm running out of memory. Only problem is I have a cracked screen and the charge goes up to $25 a month instead, so obviously I would do better to have it repaired. I have heard of people getting cracked screens replaced under warranty, is it possible and how would I go about doing it ? Other options would be do it myself, or paying some cell phone shop $90 to do it for me.