This is Samsung S 8plus Verizon and this was always unlocked been for over two years but now its saying its not unlocked?

your phone seems to be unlocked, it only displays that sim is not from verizon, if it was locked, it will display INVALID SIM. go to settings, networks (or more networks) and then switch to gsm if you still need help, you can contact me at davidunlock.com & davidunlock.net. i have been doing unlocking for past 22 years, we have the best customer service and lowest prices.