T-Mobile subscribers are facing issues with SIM activation due to a widespread outage. Users are unable to make calls, send texts, or connect to the internet after activating a new physical or eSIM, ...

What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

You can just buy a bare sim card at the T-Mobile store or online as well, I think it's $8 or something like that (with $5 of airtime credit). You can't technically activate the $30/mo plan in-store ...