if I purchase iPhone 7 plus (T-Mobile) from apple website by paying full amount, can I use it with GSM carrier outside US directly ?

if I purchase iPhone 7 plus (T-Mobile) from apple website by paying full amount, can i use it with GSM carrier outside US directly ? or do I need to activate the iPhone 7 plus with T-Mobile sim card which will be provided with iPhone ? Also will there be any formalities that I need to carry out with T-Mobile in order to use the iPhone outside US with other GSM carriers.

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