The T-Mobile varient (D801) will need to be unlocked to work on other carriers.
I actually cancelled my Nexus 5 order and ordered an LG G2 so it doesn't come in until later today.
I tried this method unlockcode247.com/imei/1/40...
I had been rooting, unlocking, installing new roms since last 1.5yrs or so. Never posted or replied single question. Finally thought I need to contribute to this community and this is my first post here as this is off topic thread. I hope one day...