OnePlus 2 receives OxygenOS 3.5.5 update, finally enables VoLTE
But, as the saying goes, better late than never. OnePlus has just announced that the latest update for the OnePlus 2 enables VoLTE functionality, but only for select carriers.
There's also a new Gaming Mode in the Settings / Developer Options, as well as additional options for the Alert Slider. Shelf optimizations have been implemented too, while the OxygenOS UI has been updated along with interface and UI of the Clock app.
Aside from the changes above, OxygenOS 3.5.5 update contains the Android security patch for the month of December. Some general bug fixes and enhancements that increase system stability have also been added.
It's important to note that Clock, Calculator and Messages apps will be replaced by stock OnePlus apps in case you've never updated the corresponding Google apps. However, you won't have any issue downloading them from Google Play after applying the update.
Another small issue that might affect your OnePlus 2 after upgrading to OxygenOS 3.5.5 is the fact that many of the phone's settings will be restored to default.
Things that are NOT allowed: