Essential Confirms Support of Android Updates for Two Years for the Essential Phone
While the future of Essential is a bit in doubt right now, the company has confirmed their commitment to their first phone, the Essential Phone, for at least 3 years. The company took to Twitter and clarified that support for the PH-1 will continue with major Android release updates for two years while Android Security Updates will be supported for three years.
Doing the math from the August 2017 release of the PH-1, that means that Android P is likely the last major version of Android for the device while you can expect security patch updates through August 2019.