Sony Ericsson T637
Will a T616 Housing Kit fit my T637?
http://www.howardforums.com/archive/topic/355782-1.html »
Please note OEM cases are much, much better quality than after-market ones. In my research, I found many reports of people not happy with the build quality of the after-market covers because they look cheap and don't fit the phone perfectly.
Good Luck!