New sky sim not supported

[DANJ2]

I have recently purchased a new sim from sky for my daughters phone. I have transferred her original number across but the sim in not working although it has been activated.

i receive a message on the phone to install another Sim from a supported network provided. I was previously with 02 not sure if this is why??

Thanks 

[PandJ2020]

Sounds like the phone is locked to O2?

Some info here: https://www.o2.co.uk/help/account/joining-and-leaving-o2/unlocking-an-o2-mobile-to-use-on-a-differen...