T-Mobile Pre-orders

can you use an ATT version on T Mo?
If you can sim unlock yeah most likely but At&T has much crappy firmware since AT&T has overtaken Verizon to have the worst carrier firmware and has a ugly AT&T logo on the back.
T-Mobile version has no branding on the phone, and their firmware is not that far off from actual LG firmware.
 
I know this is the TMo thread but.....I did stop into an AT&T store yesterday and they did have the V30 on display. The V30 is MUCH lighter than the V10 and V20 and thinner. Did not have enough time to give the screen a workout. Based on just the weight and how it feels in-hand, I will upgrade to the V30. Think I will wait for a price drop (and maybe more colors?) before I upgrade though. I just don't have the "I must upgrade now feeling!"