With Mint Mobile, you will need to reach out to their help center to change your number. You can either chat with them online or call 800-683-7392 between 5 a.m. and 7 p.m. PT.

Enter the current time on the keypad using the twenty-four-hour time format. If the current time is 2:00 PM, for example, then type "1400" on the keypad. If the time is 4:30 AM, enter "0430." ...