07-01-2019 12:06 PM
@Skinner33: It should do. BT Mobile uses EE's network.
07-01-2019 01:08 PM
Welcome to the EE Community.
Although BT Mobile uses the EE network, they have started to lock some handsets to the BT Mobile service.
If you purchased your P20 Pro direct from BT, it would need to be unlocked before it can be used with an EE SIM.
You can find out more over in the BT help and support pages.