How tf do they work?
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Your cell service provider needs some way to verify that any random cell phone attempting to connect to their network is authorized to do so. If they didn’t make sure of this, people could just connect for free. Also, your cell phone needs some way to know which portions of the cell signal it is supposed to be listening to in order to complete your phone call or data request.
These needs are met by the SIM card, which you have to register with your carrier if you are starting new service. The SIM card provides the information needed so that your cell phone can prove to nearby cell towers that it is authorized to use a particular network, and that information also tells the cell network how to attempt to connect to your phone.
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