In modern day flagships companies can only moderate and check so much internally before the product is released. Certain version(s) of the Nexus 6P with the model ‘MDB08K’ are prone to a glitch deemed the “AcquaNINJA Glitch” by Google Executives due to it being the first reported via AcquaNINJA. This glitch affects certain bands which will affect certain companies currently MetroPCS / T-Mobile are confirmed. This issue concerns where the Nexus 6P tethering/hotspot feature will seem to function properly, but when another device tries to connect it will show the infamous “!” on later versions of Android (i.e. lollipop, marshmallow) and the “∆” on iOS devices meaning the connection between the two is severed. Google is developing a patch for these variants soon and the fix is imminent. If you have a Nexus 6P with this model number just be patient in the upcoming weeks.
AcquaNINJA 