Can I use my O2 Sim in a OnePlus 8/9?

[Aq]

Hello, 

I know O2 don't stock the OnePlus 8/9. If I bought it direct from OnePlus, would my O2 simcard + data work in a OnePlus device? 

I've had an O2 Monthly sim-only for years in a Samsung but I don't want to commit to buying a OnePlus if my O2 sim won't work. (current phone is on its last legs)

I've read conflicting articles online, some saying it'll work, some saying it will not. 

Thanks

[O2EmmaLouise · Accepted solution]

Hi @Aq,

You shouldn't have any problems using your sim card in that phone providing it's unlocked. 

If you've been using your sim card in an older Samsung then the data should be fine too.

[MI5]

@Aq 

As far as I am aware, there's no OP device approved for 5g on O2 network.

No one managed to get 5g on the OP8 so I expect the OP9 to be the same too.