The quick question is: is there any difference in how one ports between selecting a new number when you order, porting later, and selecting to port when you order?
I am switching from Puppy Wireless (Verizon MVNO), bringing an unlocked Pixel 6. When I put in my order, I selected a new number since I wanted to use most of my paid month before porting. I've ported my number 2-3 times but it's been a while and with phones that didn't use SIMs. I also have my number linked to Google Voice and use that number for calls, though there are some systems that don't recognize the GV number as a "mobile" number for texts so I have to use the phone's actual number. I may need to remove/re-add the number after I complete this process.
If I just swap out the pSIM and start the porting process, at some point does the number just switch from the new number that I got when ordering to the ported-in number seamlessly assuming all goes as expected? When I got the new phone, I just moved the SIM from the old one, but there wasn't a change in the service. The instructions address porting when you order it that way; I'm not sure if it's different if it's done later.