The OnePlus 6 has a total of 10 SIM slots. Some people may find this to be a downside, as it may be difficult to add multiple carriers. However, if you are someone who only uses one or two carriers, this shouldn’t be an issue. Additionally, there is the option to use an eSIM instead of a physical SIM card.
This means that you can use your OnePlus 6 with any carrier that supports eSIMs. Overall, the OnePlus 6 has a lot of features and options that are unique among other smartphones on the market.