I just purchased my wife a Samsung S21 FE directly from Samsung, as they were offering free Galaxy earbuds with the order. My wife presently has a Samsung S8. Can I take the SIM Card from the S8 and put it in the new S21 FE phone? Suspect would then have to call Tmobile customer support to change the EIN number. Do I have to call Tmobile or go to a store to get a new SIM card? Something else? Any help is appreciated. Thanks.