if you are under the 1 year limited warranty then you will get a new/refurb
device for this.. just tell them how you dropped your phone. just leave out the part about your cracked screen.
all apple will do is give you a refurb phone right back anyway.. its a phone that someone else broke and took back and was fixed. its the same thing they will do with this device after you take it back. they fix it , change the outside glass front and back and then they use it for there give backs.. so apple will not miss out on any money.
$$$
thats y they dont sell any refurb iphones. they use them for the warranty give back trade ins.... they fix your broke crap and sell it to att for xxx amount and make more money off of a repaired device.. from att the phone is only $99 but after the 2 years in contract the phone makes over $2500 in service bills.. so to att the refurb device is just as good as the fresh one and will make them over $2500 in two years.. times your bill by 24 months....
sorry for the rant but bottom line is that they will take it back and give you a replacement if its under 1 year from the original sale date. if over a year they will charge you for any repairs..