A SIM card is made up of a silicon integrated circuit chip onto a plastic card. It stores personal data such as contact details and messages.
SIM is an acronym that stands for, Subscriber Identification Module. It was developed by Munich smart-card maker Giesecke and Devrient in 1991.
SIM cards store network-specific information used to authenticate and identify subscribers on the network. Most important is ICCID number. ICCID is the Integrated Circuit Card Identity. It is the 18 to 22-digit code that is printed on the back of your SIM. It can also be found on the plastic card where your SIM card is attached. Every ICCID number is unique and serves as an identifier for your SIM card.
International Mobile Subscriber Identity (IMSI) and authentication keys are very important in the manufacture of the SIM card.
Service dialling numbers (SDN), service provider name (SPN), and value-added service (VAS) are amongst the data the SIM card stores.
SIM cards are chips that hold information and allow you to connect with your network. This means you can make calls, send text messages and connect to mobile services like 3G, 4G, and 5G. You can decide to save messages and emails on them.
Do you take SIM card out an iPhone before selling it?
A SIM card is a smart card inside a mobile phone which carries an identification number that is unique to the owner. This means it is traceable to the owner. In the event that your SIM card remains in your iPhone before being sold, the new user can use it for illegal activities such as fraud.
Your mobile network provider and the authorities can trace the information used to register the SIM card which can land you in big trouble.
It is therefore imperative to remove your SIM card from an iPhone before selling it.