When switching carriers, you'll need both your T-Mobile account number and Transfer PIN. Here's exactly how to get them.
Found at the top of any T-Mobile bill or under Account > Profile > Account information in the app or web portal.
Dial *PORT (*7678) on your T-Mobile device
Follow prompts to verify your identity
You'll receive a text message containing your 6-digit PIN valid for seven days
Call 1-877-746-0909 for manual verification.
Yes, after seven days.
Access your account details and start the porting process.