If the device had been on your contract for at least 6 months, even if that contract has now been cancelled, you can just apply using the Unlocking your device form as the Pay Monthly option and giving the mobile number that it used to have. It will first show your current phone on that number & ask whether that is the device you want to unlock? If not, you will then have to type in the IMEI of the old phone.
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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.
ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC => 2014: EE 20 Meg WBC