In most cases, you need one. However, there are some exceptions for specific AT&T plans. For example, if you have a FirstNet account, only the FirstNet and Family plan needs a transfer PIN. No other FirstNet plan does. AT&T's Prepaid and business accounts don't need a transfer PIN. Con...
(The following instructions are for switching from AT&T Wireless; if you’re on AT&T Prepaid, there are different instructions to follow to transfer your number to Mint.) Make sure your AT&T account is still active until the number transfers over to Mint. If you cancel your AT&T account ...