Sony is very good at making Android devices, and even though they are not very popular in the United States, they are still around. Information about the release date of Android M (also known as version 6.0 or Marshmallow) has been very scarce as far as Sony is concerned in the United States, but here is what is known about the Android M Version 6.0 Marshmallow Release Date for Sony Xperia Z5, Z4, Z3, and Z2 on T-Mobile, Sprint, AT&T, US Cellular, and Verizon.
What is very strange about the rollout of Android M to Sony products is one can usually find out information about what United States carriers have it or don't have it. In the case of Sony, there has been a lot of information about what countries have it, but very little talk about what carriers have it in the United States.
By now, a lot of Sony's competitors like LG, HTC, and Samsung have Android 6.0 on their flagship devices. Some of the most recent information on Android Authority about the Sony Xperia Z5 (current flagship from Sony) is on the end of March, and that includes the other phones in the Z5 series like the Z5 Compact and Z5 Premium.
In fact, most of the information about any of the Xperia Z series is focused on how the update kicked off Internationally. This would include the Z4 Tablet, as well as Sony's Z3 and Z3 Compact, not to mention the Xperia Z2 and Z2 Tablet.
Tech Radar has reported that Sony is still working on bringing the update to the Xperia Z3 Tablet Compact, Xperia M5, Xperia C5 Ultra, Xperia M4 Aqua, and Xperia C4. We will have to see when those become available.
A report from Gotta Be Mobile states that Sony is the only manufacturer with developer previews of Android N, which will be the next version of the Android operating system that we will have to cover once it is fully unveiled.
The issue with Sony is that there is so little word on what US carriers have Android M or not, that there is doubts whether anyone in America has it at all. One wouldn't think that would be the truth, as so many newer Android phones is getting Marshmallow, or have had it for at most a few months.
If you have one of Sony's newer phones, and you live in the United States, it is highly suggested that you should go into the "Settings" and "System Update" to see if the upgrade is available. The upgrade may not be available depending on your carrier like T-Mobile, Sprint, US Cellular, AT&T, and Verizon.
Assuming that you are able to get your Over The Air (OTA) download of Android M on your Sony device, please leave a comment about what device and carrier that you have.