Moto G Pure unlock

The mobile is locked to their network which means they are able to unlock it with a code remotely... When I  put in my sim card in the phone it instantly asked me for the sim unlocking code.... Why not give me the code to unlock it 

Yes but look at the requirements to be eligible for an unlock code and see if you meet all the requirements.

https://www.t-mobile.com/responsibility/consumer-info/policies/sim-unlock-policy

Hey there @Ebdah1! I used the IMEI checker on the T-Mobile Bring Your Own Phone page. It shows that it is a Motorola moto g pure phone, so that tells me that the IMEI is not fake. 

The reason it is not prompting for an unlock code is because newer phones no longer have you enter a code. The new way to unlock phones depends on the manufacturer and steps can be found on our T-Mobile device unlock T-Mobile Support page. 

• Motorola: Settings > About phone > Device unlock > Continue

Have you tried these steps while the phone is connected to Wi-Fi? 

Thank you for sharing the exact error message. The Unlock Terms and Conditions that @gramps28 linked above explain that there are some requirements that have to be met for a phone to be eligible for unlock. Any T-Mobile locked phone has to be used on the T-Mobile network for at least one day and at least 40 days had to have passed since that first use date. It seems like whoever purchased the phone from T-Mobile originally never used it on the T-Mobile network to make it eligible for that unlock. Since you are in Australia and don’t have T-Mobile service, your best bet is going to be going back to the person you bought this phone from and getting your money back. 

Considering how little the AUD is worth in comparison to the USD.  You might be better off visiting your local cellphone repair shop to see if they can unlock it for you for a fee.  By the time you ship that to Florida, get the SIM, add the $100 USD in refills, wait the 17 days after activation, request the SIM Unlock (which might take a few more days or more), and then shipping it back to Australia once SIM unlocked...  You could just buy a new phone or have had that one SIM unlocked locally for a lot cheaper.