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ALSO, I TRIED THIS AND IT WORKED ON MY FACTORY UNLOCKED S21 ULTRA (SM-G998U1).

EVERYONE HERE TRY RUNNING A CELL PROVIDER SOFTWARE UPDATE. THIS CREATES THE APN DURING THE UPDATE AND ITS THERE AFTER A RESET.AGAIN, GO IN SETTINGS, FIND SYSTEM UPDATES AND RUN A SOFTWARE UPDATE (ITS SERVICE RELATED, ITS NOT A ANDROID OS UPDATE). SON...