There's been some chatter in r/visible about this, but the OnePlus 8 model Visible sells is seriously crippled.
-It's almost 5 months behind the unlocked OnePlus 8 (sold direct from OnePlus) on updates and still hasn't been updated to Android 11.
-It is single sim only, and the software does not allow for dual sim, unlike the unlocked model direct from OnePlus which is dual sim.
-There have been reports of 5G not working on other carriers, which could potentially mean the software has been altered (this is difficult to confirm, but I do not have the option for 5G in my settings mens and have not been able to connect to T-Mobile's 5G network using my T-Mobile sim).
Customer service is also largely clueless about this - every agent I've spoken to has said something different about the device situation. Until Visible clears up this situation you're much better off avoiding purchasing the OnePlus 8 direct from Visible.