Can only get internet through WiFi not conneting to 4G
I was out of the country for 10 weeks and used an Italian Sim card. I replaced it on the plane home with my U.S. sim and it worked that night but the next day I was unable to connect to the internet. I can only use wifi and can’t get 4G. I’ve turned off my phone re inserted the sim and battery. and restarted. Nothing has helped. Help!!