it's probably sim free too
to root.... ota to latest kitkat, then use towel root and then install SuperSU from the market. Or find the latest ioroot, which is 25 I think, the thread is in the g2 android development section here .. both methods are very easy
then if you want custom recovery for flashing roms just install autorec for your variant, don't use the wrong version. just double check your installing the d802 one. autorec thread is in the development section too.
warning.. golden rule is to never take ota if you have a custom recovery installed, or you will be following one of the more technical threads to unbrick.
note.. these methods are for KitKat.. for jellybean I don't know