Samsung SGH-G800 Cellular Phone "memory cars wont read" Questions

...wont read my memory card! a few days ago i took my memory card out of my phone and when i went to put it back in a few minutes later there were no pictures on my phone! So, when i went to memory it ...

...Cars and put it in my new phone the LG Xenon, which is an AT&T phone but unlocked for T-mobile. I am trying to get the info off of the memory card and use it on my new phone but the phone is not ...