[Q] Flashing a T-Mobile Rom into Sprint LG G3. topic

I apologize for my incompetence before hand. I've been scouring the internet trying to find a method where I can use my LG G3 for T-Mobile. Would it be wise to flash a T-Mobile rom into the phone? Has anyone tried it? Also, what is the most efficient way to unlock the G3. I've done the shortcut method and I was wondering if there were any other methods. Thanks.