OnePlus 2 receives OxygenOS 3.5.5 update, finally enables VoLTE

There are a couple of new features and improvements included in the update as well. For example, OnePlus added App Lock and Battery Saving Mode, which can be found in the Settings / Battery / More.
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.
As always, this OTA (over the air) will be incremental, which means it will first reach a small percentage of users in the first day, but OnePlus will begin broader rollout in the coming days.
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