We already know OnePlus had plans to bring Face Unlock to the older OnePlus 3 and 3T. Now, the feature is coming to these phones through the OxygenOS beta build. It’s available through Open Beta 30 for the OnePlus 3 and OnePlus 21 for the OnePlus 3T. The update also brings with it OnePlus Switch app for backup & restore, as well as other changes. As GSMArena points out, there’s a possibility the update might not work with some third-party camera apps. And as with any beta build, things might go a bit awry every now and then so be prepared for that to happen.