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Every carrier has a particular method to port out your number. But, each porting process starts out identically:
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You need the number you are porting still active with the carrier. If you are taking advantage of a trade-in promo, the request needs to be made prior to trading in.
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You need to use the carrier supported method to obtain a Number Transfer PIN
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T-Mobile app:- 
Open the T-Mobile app and tap Account
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Tap Line Settings
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Tap Request a transfer PIN
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Follow the prompts
 
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T-Mobile.com- 
Log in to T-Mobile account
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Click Account in the upper right corner
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Click Profile Settings
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Click Line Settings
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Click Request a Transfer PIN
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Follow the prompts
 
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