SIM (Subscriber Identification Module) card is a specially programmed microchip that stores network identification data. SIM Cards are specific to each carrier network — AT&T or Verizon or T-Mobile.
The Tri-cut, 3-in-1 SIM cards are small, removable smart cards used to store data like your mobile phone number and the phone carrier you use. When you bring your router or hotspot to 4G LTE, you will need to replace your existing SIM card with a new one so that our network can identify you as a customer. It is pretty simple, you remove the old and put in the new!