Early in October Sony promised to update at least fourteen of its Xperia devices to Android 6.0 Marshmallow. Though the Japanese manufacturer didn't give out the specific timeline for the Android M update, it was expected that devices such as the Z5 series (Z5, Z5 Compact, Z5 Premium) will headline by receiving the Marshmallow over-the-air update by the end the year.  Other Xperia devices included the Z3, Z3+, Z3 Compact, Z2, Z2 Tablet, Z3 Tablet Compact, and Z4 Tablet, along with their dual SIM equivalents.However, none of the Xperia devices have been able to receive the official complete Marshmallow update. So far, only two of the Sony handsets, the Xperia Z3 and Z3 Compact have been lucky enough to get a taste of Sony's Concept Android Marshmallow update.  Xperia Z3 and Z3 Compact recently received an experimental OTA update of Sony's Concept Android Marshmallow.In addition to the 'Concept' testing the Sony company delighted with UI skins prior to allowing a limited group of beta testers to enjoy an early version of the Marshmallow stock experience.Though the source code for the Android Marshmallow was availed by Google over two months ago, this Concept test is set to continue running before the initial planned deadline. This according to Sony is because ending will be counterproductive, as it is already going well for users.Sony, did not however disclose an alternative date for the cutoff, but if their plan is to make a public assessment of every minor aspect of the update's maintenance before they they release the official wider roll-out, then the initiative will likely end when Z3 and Z3 Compact eventually receive the complete, fully polished and stable , OTA Marshmallow. 

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What's my model number?

There are several ways to locate your model number:

Option 1
On your device, go to Settings, then "About device" and scroll down to "Model number"
Option 2
Often times you can view the model number inside the device, by removing the battery
Option 3
Using Samsung's model/serial number location tool

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