You can sign up for the Visible free trial if your phone supports eSIM and is compatible with Visible. The problem with the free trial is that it will only provide you with the base plan experience - i.e. always deprioritized which may be unusable in overloaded areas.
If you don't mind spending a few bucks you could always signup for the Visible+ or Visible+ Pro Plans for a month and try it out on a monthly basis. You could then port your existing number in at a later date if satisfied. That's what I did way back when I originally signed up since I didn't want to risk losing my number with porting in and back out if unsatisfied. Read through some of the thread and you'll see that there are some sporadic problems porting in/out of Visible.
FWIW, I actually picked up a physical SIM at Best Buy - up until recently it wan't possible after that program was suspended, the good news is Best Buy is now back to selling prepaid Visible plans after a lengthy absence.
