It used to be that if you knew someone with a contract sim that the phone is unlocked to, you could just contact the airtime supplier for the code and they send you the code by text. I once unlocked half a dozen phones with my out of contract Vodafone sim but that was about 10 years ago!
I've only done it for an old nokia non-smartphone which had no sim in it about a year ago locked to the defunt orange network.
All EE wanted about the phone was the IMEI number.
They also wanted my full details and then the unlock code and instructions for its use were emailed to me.
No sim card was required to do any of this
I expect they will want payment for doing this
Or simply 'dial' *#06#. This will show you the IMEI number on screen. Works on every phone.
Doesn't make a lot of difference it's on O2 at the moment
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local