All T-Mobile phones are sold locked. They must be used on an active T-Mobile plan* for at least 40 days and be fully paid off before they will be unlocked. The idea is that T-Mobile sells phones to support their wireless business, not the other way around.

*Prepaid is different.

Hi 

Thanks for replying

What about Prepaid ? Kindly elaborate

If I buy phone online from Amazon / Newegg, Will it be treated as Prepaid ?

How can I unlock it in that case ?

Regards

You're better off buying one direct from Google if you need it unlocked.

T-Mobile’s SIM Unlock Policy is very straight forward for the prepaid and postpaid requirements to qualify for the device to be SIM unlocked.  

SIM Unlock Policy | Unlock Your Mobile Wireless Device | T-Mobile

Thank you all 

What about the websites like https://mobileunlocks.com/ & www.mobileunlocked.com ?

They charge about 28USD & get the unlock done.

Any idea ?

Please help

Third party sites can SIM unlock Android devices.  Just make sure any unlocking site you use is not a scam.  Local cellphone repair shops usually.odder unlocking services too.

I really wish there was an official way to unlock a brand new device.

Do not wish to wait for 40 / 365 days

Kindly let me know, if anyone knows

Thanks

Only the Google store sells unlocked Pixels.

You can always temporary unlock the Pixel till you meet the requirements.