August 28th, 2017 
Marty Figgs 
It’s been a few months, but OnePlus is again updating its 2015 flagship to a new version of the OxygenOS software, v3.5.5. The OTA brings a slew of new things, the most notable being VoLTE support. This update comes with a few caveats, which we’ll get into after the changelog.
- Enabled VoLTE functionality for select carriers
- Added App Lock
- Added Battery Saving Mode ( Settings > Battery > More )
- Added Gaming Mode ( Settings > Developer Options )
- Added Additional Options for the Alert Slider.
The OnePlus 2 receives OxygenOS 3.5.5, brings VoLTE support and other new features was written by the awesome team at Android Police.
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