[tsac]

Generally if the phonies still under warrantee and the store is reputable they will work with you to replace the phone. I would be very careful when you tell them how it broke and where you normally carry the phone.
Example if your someone who carries the phone in a rear pocket you stand the chance of bending it and any cell phone will have issues. Some the glass breaks and some the glass pops off. the bigger issue is if the phone does this due to user caused damage the vendors in most cases will not replace.
This is not a blackberry issue, all including I-Phone, Samsung and others do it.

you can try pushing it back on, it may work but be careful.