@JonjoYou might want to take your sim card out and re seat it. It might be lose / not properly installed. Most of the NO SIM CARD error or SIM CARD NOT DETECTED occurs when the SIM card is not inserted properly or loose so that cell phone won't recognize SIM card.
Have you tried to reconnect manually to public mobile under "mobile network settings"?
If you just ported, it takes some time, every hour or so remove your battery / restart your phone. It can take time on your first port over.
If the issue continues you may have a partially completed port, sometimes ports just take a bit longer. One of the moderators can take a look, see if they need to do something to move it along. Click this to send them a message
I know it can be a little frustrating to wait but send a message to the moderator team and include your name, account number and/or phone number and pin number and they will get back to you asoon as they can between Monday-Friday 9am-9pm (EDT) and Satuday-Sunday 9AM-7:30PM (EDT)
For more information about contacting a moderator Click Here
