This depends on your current situation:
Did you originally port a phone number into Sideline?
- If YES, then you do not need to pay to port out your number
- If NO, and are wishing to port your assigned Sideline number out, then you will need to already be subscribed to Sideline Pro/Remove Ads bundle or pay the one-time fee of $19.99 to unlock the number.
Once you've done this, you can begin the port out process where you will receive your Account and PIN numbers you can provide to the winning carrier (the carrier or service you're taking the number to).
When your port is successfully completed, make sure you cancel your subscriptions through your app store, unless you plan on choosing a new Sideline number and wish to benefit from the added features (no advertisements, Wi-Fi calling option, and prevention of phone number expiration).