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 
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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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All port-ins require the obtained PIN and your current account number 
AT&T: With ATT there are three methods of obtaining the Number Transfer PIN
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Call *7678 (*PORT) 
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This will give you a voice prompt dialog flow to get your Number Transfer PIN. 
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Requires your account passcode to generate the PORT 
 
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On the myAT&T app 
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Log into the app 
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Go into the profile page in the app and tap People & Permissions.
 
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Scroll down to Transfer phone number then select Request a New Pin
 
 
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Using the AT&T Website 
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On the web page menu find People & Permissions.
 
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Select Wireless
 
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Select Transfer phone number and Request a new PIN