To stop saving and sending payments towards your phone bill, open your goal and select "Settings."
Choose "Delete" on the screen that appears.
Digit will ask you to confirm that you want to delete this goal, and let you know that anything saved will be returned to your connected checking account. If you have saves that are pending posting to Digit at the time you delete your goal, those saves will still be debited from your checking account and then returned automatically to checking when they post to Digit.
Once deleted, your goal will no longer be active for savings and payments.