If you have been paying attention to this forum there have been several discussions about the AT&T (and other carrier's) Nexus 6 being sim locked to their network as well as coming with a carrier boot logo, and a carrier emblem on the back. The boot logo can be removed with root and the carrier emblem can either be scraped off with a credit card or covered up with a skin (ie dbrand). But unlocking the sim is not that easy. At&t, and other carriers realize people can use their device on other carriers so in an effort to keep someone from running off with a $700 phone that they only paid $20 for, they lock the sim so it can not be used anywhere else. And as much as we would like to give the carriers grief for locking the sim, I understand their position and blame the dishonest people out there more than the carrier. With that said you still should be allowed to unlock your device especially if you paid full price for it. So here are the ways you can unlock your AT&T Nexus 6 and use it on other carriers. After paying for the device you are going to have to contact AT&T to have them send you your unlock pin. This will take several days but it will cost you nothing. Each unlock pin is different so do not try and copy someone else's unlock code thinking it is the same for all Nexus 6s, doing so will cause you to hard lock your device. Visit the AT&T "device unlock" site to request a sim unlock. If you run into any issues call AT&T as I was unable to unlock my Nexus 6 through that site (as I bought it on opening day before they updated their system) and had CS create a case number for a service tech to email me my pin. Another way you can unlock your Nexus 6 is through a company called CellUnlocker.net. These guys are fairly quick about getting you your unlock pin in a matter of hours. And in the invent they are unable to they will refund your purchase. The staff is very supportive and the process is much faster than waiting for the carrier. Please make sure that your device is not already sim unlocked or hard locked before purchasing from CellUnlocker. Note: If you are looking to use the Nexus 6 on Verizon know you are not going to be able to just walk in and request a sim card as that IMEI is not located in their system. So here are several ways to use the Nexus 6 on Verizon. If you have a line open for an iPhone 6, Moto X, or any other device that uses a nano sim you can pop that sim in your Nexus 6 and it should work. Open a line for any LTE device and use a nano sim cutter to cut the sim to size so that it will fit in the Nexus 6.