Verizon has its own exclusive version of the OnePlus 8, the’OnePlus 8 5G UW,’ designed specifically for its network with additional mmwave radio features to support Verizon’s 5G network. The Verizon version has its volume buttons moved lower than the unlocked and T-Mobile models, so standard OnePlus 8 cases wo n’t fit.
The Verizon model has several extra mmwave modules. One of which is directly located where the volume switches are. It may take some time before case makers catch on, and cases that completely cover the buttons wo n’t work.
Most cases for the OnePlus 8 on sites like Amazon are designed for the unlocked / T-Mobile hardware, not Verizon’s specific variant. Odds are you’ll have to get it from Verizon directly, where cases tend to be more expensive and the selection more limited.