Consolidating your number into Google Voice gives you flexibility to manage calls and messages across devices and carriers. Here's how to transfer your AT&T number.
Sign in to Google Voice (voice.google.com) and select Port your number
Enter your AT&T number and follow prompts
Provide your AT&T account details for verification
Pay the one-time port-in fee (currently $20)
Wait for notification from Google and AT&T: port usually completes within ~24 hours for mobile numbers
Typically less than an hour—most processing happens in the background.
No from AT&T; only the port-in fee to Google applies.
Start the porting process and take your AT&T number to Google Voice.