Unlocking phone to any network

[Mhk94]

Hello, my dad is currently with 02 business sim only - using my sisters old phone which was also bought through 02.

We want to unlock the phone to any network however upon contacting o2 and them taking all the details and IMEI they have said he needs to log into iTunes with the account that purchased the phone first before he can unlock it?
My sister does not and never has had iTunes?

So apparently they are unable to help us.

We have been at this for 2 days now so if anybody could help I would really appreciate it.

Thank you 

[MI5 · Accepted solution]

@Mhk94 

That's rubbish, but the iTunes login is the same as your Apple ID anyway.

Sometimes required to complete the process but not to start it.

Guide here Guide: Unlocking an O2 phone to use a different SIM card 

[Oxonian]

@Mhk94 

Are you sure that the 'phone is actually locked ? The posts by @Bambino and @Enlli on this thread might be worth checking out :-

Solved: Is my phone unblocked? - O2 Community

https://community.o2.co.uk/t5/Tech-Support/Is-my-phone-unblocked/td-p/1688506

[MI5]

As covered in the guide already posted.