I'll try to update my experience when I get the approval unlock via unlock4less... But right now, here are the steps:
1) Find an unlock service of your choice (I used unlock4less)
2) Enter the IMEI from the back of the phone (15 digit) or back of the box (14 digit, unlock4less accepts it and guess the last digit)
3) Wait for their approval for unlock
4) Once approve, find a non-Sprint SIM and boot the phone up with the non-Sprint SIM and it should take a few seconds to a minute as it connects with the server to find the unlock (make sure to be connected on wifi)
That should be it.
If you want to turn on/set up the phone before it is unlocked, you must use the Sprint SIM, otherwise it will not go through the activation screen, as I tried setting it up using an AT&T SIM, but couldn't get past the SIM activation screen.
Instead of an iPhone SE I ordered, they charged me and shipped me an LG Tribute 2 for Virgin Mobile instead.
Please Share Unlocking Experience