Apart from the fact that the phone simply accepts a new SIM card, everything remains the same. It can make the trip a lot easier, and you can even use new offers from other carriers. How to Unlock a T-Mobile iPhone 8 Plus and iPhone 8 Before submitting the upload request, we recommend checking the IMEI code if it is blocked or blacklisted. If you decide to use one, please be sure to read all the fine prints before you buy because they can surprise you with extra bills at the end of the process. The iPhone you are trying to unlock must be a T-Mobile iPhone iPhone can not be reported as stolen or lost in the T-Mobile database. The T-Mobile account connected to iPhone must be in perfect order. Unlock 2 mobile devices within a 12 month period. All service obligations and deductions plans for iPhone must be completed and all fees will be paid in full. T-Mobile may also request additional proof of purchase for iPhone. You can check the full detailed requirements and authorization of your T-Mobile iPhone Unlock by visiting their website for backup. Can A Police Officer Make You Unlock Your Phone. Remember, you do not pay in advance and financially support the carriers, so it only for them to try and support their customers until they get the money back. How To Unlock Lock Screen On Iphone 4.