Sony Xperia C4 is being updated to Android 6.0 Marshmallow14
It looks like Marshmallow is the last major update that the Xperia C4 is receiving, as Sony hasn't included the phone on its list of devices that will get Android 7.0 Nougat. Nevertheless, Xperia C4 owners will certainly appreciate having Marshmallow on their phone instead of Lollipop, as the former brings important features like Doze (for longer battery life), enhanced app permissions, and Google Now on Tap.
Right now, Sony isn't selling new Xperia C4 units in the US, but you can still find the handset, pre-owned, at Best Buy, which is offering it for $169.99 unlocked.
via: Xperia Blog