@Staceyhot you mean the EE network as the iPhone X is not available on T-Mobile.
Please click the link below to see your opinions and costs if applicable and you must select the one that applies to you.
Did you buy this device yourself new direct from EE or is it 2nd-hand? The process & costs are different.
Welcome to the EE Community.
If your phone is locked to EE, please see Unlocking your EE mobile phone or device.
If it's locked to the T-Mobile network outside of the UK, please contact the network directly.
Hope this helps.
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