The best place to find out about your phone and accessories for it is on the Samsung's Website, the Sprint website only gives quick overviews, which they readily admit, and feel that no one should know as much about a phone as it's manufacturer. Replacement accessories should be easy to find for a Samsung as most of them use the same connector, with a very few exceptions which I don't believe that the A900 is one of. Try to get Original manufacturers equipment, it tends to be assembled better with higher quality materials.
