Nexus 5X probably will work with all operators in the US
Quite probably Nexus 5X and Nexus 6P to work with all mobile operators in the territory of the US. The information is not official and came after Google filed for regulatory approval of the new model 5X at the Federal Communications Commission (FCC). The documentation contains a description of the phone model that runs at least partially with each operator in the US.
Compatibility may not be complete – the new Nexus will probably not work with 3G network of T-Mobile, but certainly more people than at present will be able to benefit from the device. Whether the rumors and assumptions are correct, we will find out soon. More about the new devices and services will learn at the Google event on September 29 in San Francisco. The scheduled time is 9 am PT. It will be broadcast live on YouTube.