How to unlock a iphone SE?

[Deluxe1]

I'm trying to unlock my sisters SE, never owned a iphone before so need advice.

I rang tesco with her IMEI and it was automated and they gave me a 8 digit code.

I've put a diff sim in and it won't activate but it's not asking me for a unlock code, what am i doing wrong?

 

[Deluxe1]

Yeah after doing some research it's a puk code I'll have to speak to someone real tomorrow.

 

[Deluxe1]

All sorted, had to ring Tesco to unlock it on their end.