Activating a T-Mobile SIM card is a straightforward process that allows you to connect your device to T-Mobile's network and enjoy their services. Whether you're a new T-Mobile customer or upgrading ...

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 ...