EE won't unlock phones that are under 6 months old as this one is. After 6 months you may follow ...
To unlock a 2nd-hand phone you need to call Customer Services on +44 800 956 6000 (option 2, option 4) to put you in touch with the Unlocking Team to request an Unlock Code. You will be asked for your email addy. They will take payment (of £8.99) from any valid UK bank card.
Once the process has been started you will receive an email from the Unlocking Team to process the unlock. It can take up to 10 days to complete the unlock.
But even so beware that EE could still refuse to unlock it. Many phones sold 2nd-hand have been reported lost or stolen, have been sold by the original owner when under 6 months old without EE's permission or have money owing on them.
If that is the case your only remedy is against whoever you got the phone from.
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To phone EE: The local rate landline number +44 207 362 0200 or Freephone +44 800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.
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