When i am asked how much it is to replace the glass for certain models such as Samsung Galaxy S3 with broken Glass, I am really hesitant to answer because of high repair price. Currently (as of Nove 16, 2012) it is $249 to replace Samsung Galaxy S3 Glass because you have to replace the front panel not just glass. Smartphone users who used iPhone and had experience replacing the glass are shocked because of the price and they think I am ripping them off.
On some models like iPhone 5, iPhone 4S, Motorola Razr, Samsung Galaxy S and some blackberries as well as some of HTC models, the screen and LCD comes as a one unit and it is not possible to separate it. Manufactures use special treatment to stick LCD to the glass to keep dust coming in under the glass, but this makes the repair cost high as well. Some repair shops will tell you that only glass can be changed so that they can get you into their door but they will tell you need to pay more since you are at their location
Thus I am here to make the list of the phones that requires to have LCD and Glass replace together even though the phone have cracked glass only or not.
Here are the list that I found. Please feel free to add comment so that I can update.