PUK code and PAC Codes assistance please

SR24

Hope someone can help with my understanding. 

I have an iPhone and am moving from a Tesco pay monthly to a different network sim only.
I completed an unlock request at Tesco mobile and they send me a text a few days later about putting sim in and connecting to ITunes??
I phoned them for advice and couldn’t get through but did get a PUK code from an automated option. Is this my unlock code? Where does ITunes come into it please?
I have the PAC code for switching my number and will submit to my new sim provider once the sim arrives, and once they confirm it has switched I can then change SIM card over in iPhone. 

Is this when I need to use this PUK code when putting my new activated sim in the iphone to ensure it is unlocked?

Sorry am sure this is obvious to many but the first time I am doing this so want to check the sequence.
Thank you.

eDicky

The PUK (Phone Unlock Key) is for unlocking your SIM when you have entered an invalid security PIN too many times, it's not for unlocking your phone from the network.

I'm not familiar with iPhone but their way of unlocking is through iTunes, you need to do as directed in their text message.

SR24

Ok thanks so assume then once my new sim arrives I have to put it in and go onto ITunes app?

Speedster2

SR24 said:

Ok thanks so assume then once my new sim arrives I have to put it in and go onto ITunes app?

Maybe, if the instructions haven’t worked yet.

https://www.tescomobile.com/help-and-support/manage-your-account/unlock-your-tesco-mobile-phone

SR24

Hi, I found the following additional info out so thought I would post it in case anyone else needs to know. The provider puts the unlock request in to Apple, then Apple send a signal to the phone to unlock it. This can be checked by going to Settings > General > About > Network Provider Lock. If it says 'No SIM restrictions', it's now unlocked.