I just set up mine - kept my old active sim in my phone, downloaded the Public Mobile app, followed instructions, chose "existing number" to port my old number (had to find my account number with the other provider I was with), and then it told me to keep the app open for 2 mins and don't minimize. Then, a text came up from my old provider asking me to confirm the port and...then I removed the old SIM and put in the PM one. Voila it seemed to work.
