DON’T MISS: You can unlock your iPhone 6 for free on any carrier starting this week – here’s how In order to unlock a device, you first have to be familiar with your carrier’s requirements ...

Or you might need to enter an unlock code provided by your current cell phone company before you can install a new SIM card.

Note: For postpaid and prepaid phones, T-Mobile may ask for proof of purchase or information about your account to grant eligibility. Does T-Mobile automatically unlock eligible phones?