The new Security update for OnePlus 6 and 6T comes with April security patch and also enables VoLTE and VoWifi (Wifi calling) support for Jio in India and for Telenor in Denmark. Other features it brings include updated versions of GMS and Cloud services. You can check out the complete changelog below.
OnePlus 6, 6T OxygenOS 10.3.3.3 Changelog:
Fixed the issue with a black screen randomly appearing while playing games
Updated GMS package to 2020.02
Updated Android Security Patch to 2020.04
Improved system stability and fixed general bugs
Integrated VoLTE & VoWifi support for Telenor – Denmark
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