A subscriber identity module (or "SIM") card is a physical or virtual card that identifies a device to a specific mobile network. SIM cards do a number of things, including storing a customer's phone number and text messages.

An unauthorized SIM swap occurs when a bad actor impersonates a Comcast customer and is able to transfer the customer's SIM, and therefore their mobile service and number, from the customer's mobile device to a mobile device in the bad actor's possession.

Port-out fraud is similar to SIM swap fraud, except in the case of port-out fraud, the bad actor impersonates the customer and transfers the customer’s phone number to a new provider and device controlled by the bad actor.

If you experience any of the following, you may have been the victim of SIM swap or port-out fraud:

• You receive a one-time pass code from Comcast that you did not request;
• You receive a notice from Comcast that you requested a SIM transfer or port out, but you did not make such a request;
• You receive a notice from Comcast that your phone number has been activated on a new device;
• Your device loses service—for example, you cannot make calls or texts, or your phone only permits 911 calls; and/or
• You receive notices of unusual or suspicious activity on other accounts—for example, social media accounts, subscription accounts, etc.