@Jlu : 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 originally came with. It will first show your new current phone on that number, if any, & 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 CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband
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 > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
