You need an unlocked phone to use MobileX. To ensure your T-Mobile phone is unlocked you need to meet these three requirements:
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Have a T-Mobile locked phone
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You either own the line/service or the account owner has authorized you to use the phone
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The phone is paid off
T-Mobile usually sends a text message informing you the device has been unlocked. You will either need to follow the steps on the page below or turn your phone off and on.