Google Pixel and Nexus series handheld mobile phone buddy note (probably not many people need to pay attention to), Google recently updated its own son system update the schedule, you can clearly understand when hand equipment will be updated, of course, you also know in advance of these devices
(Galaxy, Nexus, Nexus, 5, Nexus, 6P)
Called the Google Pro son of Pixel and Nexus series, are subject to many Android users because they run the native Android system, and can precede other manufacturers of Android mobile phone system to receive the latest updates, and more important the monthly security update.
(patriarch Nexus series diagram from:Androidcentral)
However, from the beginning of the Galaxy Nexus era, Google announced the Nexus equipment in at least 2 years (from the first store shelves in Google date) will get updated version of Android, after 2 years will not be able to guarantee will provide subsequent updates to users, then comes the release of Android 4.4, the hardware can eat Android 4.4 Galaxy Nexus stay in Android 4.3, the reason given by Google was Galaxy Nexus using TI processors, incompatible with the new system.
(Nexus update plan map from:Google)
After the Google draw a more detailed system update schedule for Nexus equipment, Nexus series, Motorola OEM Nexus 6 already in October last year to stop accepting system updates, and security updates will also stop in October this year, any related services also stop in the year, but also stay in Android 7.
Nexus series of Nexus 6P and Nexus 5X peak in September of this year will get Android 8 update, no longer get system level updates, security updates will only receive monthly, and security update support will stop in 2018 September, perhaps at that time, the Nexus generation is really over.
(Pixel series update plan from:Google)
The new son inherited the mantle of Nexus Pixel series, according to Google policy update two systems, the first generation Pixel and Pixel XL will get a big update last system in 2018 of October, after the security update will continue until the end of October 2019.
(Google, Pixel, XL, and Nexus, 6P diagrams, from:Phandroid)
Although many people would think that even the latest Android One Google mobile phones (cheap, low equipped with native Android devices) can eat new systems, old equipment hardware is not out of date, why not update?. First of all, the old and new hardware system adaptation problems, to optimize the new system is of course to a new device, and the new system in the old equipment may not be optimized, in Nexus 6P and Nexus 5X last year received the Android 7 update occurs when the battery of diabetes insipidus after two times, safety the update was improved to some extent the battery problem.
In addition, for the desire to transition to do hardware Google, if still great compassion for the old equipment to update the new system, originally sold Nexus and Pixel series is more difficult to popularize.