anyone know how to format a memory card on an AT&T LG xenon
Unfortunately I don't believe you can format it in the Xenon itself. I would try something else. Other phones you know of will format, aka Blackberry. Also, computers can format it. Why do you need to format? Just to re-do the memory.
Is getting the memory card replaced via warranty an option? Perhaps just buying a cheap one maybe with more memory this time. I hear 4GB are like $10 bucks now.