"Your current wireless provider may call or text you to authorize the number transfer. Please respond within 30 minutes to authorize the number transfer. Failure to do so may result in a rejection of transfer.
The messages from the current provider are typically sent immediately after they receive the number transfer request or between 10:00am and 12:00pm on the next business day. You may also call your current provider to authorize the number transfer, a list of numbers is provided at the bottom of this article."
https://support.fongo.com/hc/en-us/arti ... r-Port-In-