If your Sony Xperia Z3 comes from T-Mobile USA then it's most likely your Cell Phone is locked with "Device Unlock App" and not asking for a unlock code (SIM Network Unlock PIN). In this situation it's very important to order the unlock of your device using this special service:
With all Sony Xperia Z3 Unlocking Code orders we usually deliver a complete set of unlocking codes. Most of the time you just need the Network Code (NCK) but when needed you'll also receive Unfreeze Code, Reset Key, or Service Provide Code. In the same email that includes your unlock code(s), you will also receive complete instructions on how to use it. Usually, you just insert the SIM card in the phone you want to use and the phone will prompt you for the unlock code. In case you need any assistance, our customer support is always there to answer any questions you might have. We will get back to you within less than 12 Hours from Monday to Friday.
Warning: Before place an order, you need to check Counter Lock Status!
In case if Sony Xperia Z3 shows (X) network lower than 5 and not 0 , then it wil be refunded.
In case if Sony Xperia Z3 shows (X) network lower than 5, it means the code was not even seen by phone, cause the counter was to be lowered to at least 4 in case of wrong code.
Important: This is for bricked and security damaged phones.
Some phones just show like this:
() network 5
() service provider 5
() subset 5
for such screen counter was not checked properly or the phone is bricked by software (5 locks on).
It must show:
(5) service provider
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