LG's site has a manual for each AT&T and Verizon variants.
Except you can't find a direct link to those manuals. You will have to search for exact model number (the product list on LG site won't help either):
For AT&T version, use model number LGW200A
For Verizon version, use model number LGW200V
Now the fun part, AT&T version will give you a link to 'English' version of manual but it actually miss-spell the filename and give you a Spanish version of manual instead.
LG site is designed by bunch of morons.