A TracFone Wireless SIM card has no distinctive carrier markings and is only marked as a 'SIM card'Ī SIM card (full form: Subscriber Identity Module or Subscriber Identification Module) is an integrated circuit (IC) intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and laptops).
