Physical SIM card
TMobile gave me a physical SIM card for my mom’s Apple five series watch when I switched her over to our plan from ATT. Do I need to install it?
Apple Watch Series 5
Apple Event: May 7th at 7 am PT
TMobile gave me a physical SIM card for my mom’s Apple five series watch when I switched her over to our plan from ATT. Do I need to install it?
Apple Watch Series 5
See the following for setting up cellular on the watch:
Set up cellular on Apple Watch - Apple Support
See the following for setting up cellular on the watch:
Set up cellular on Apple Watch - Apple Support
No, there's no way to install a physical SIM card in an Apple Watch. T-Mobile should have activated the service directly on the watch via a digital sim also known as an eSIM.
Physical SIM card