If you don’t need the 3G connection your LG Xenon, for sure turn it off, the following is the LG Xenon’s factory default Dual Mode and it’s easy to access the menu. LG Phone Problem and Solution
From the standby screen [on your LG Xenon]
Done it already! You have now forced your LG Xenon into using on 2G only sevice. LG-Xenon info
LG Xenon Phone Photos – LG Cell Phone Pictures

LG Cell Phone – Related Posts
you can change the 2g back to 3g if you want afterwards right?