A SIM card *identifies* your phone. If you try to place a call without once, then the cell tower just says “nah, I don’t know who you are, fuck off” and the call fails.
There’s a special exception for calling emergency services, though. If you’re calling an emergency number then the cell tower says “sure, you don’t need to identify yourself, it’s an emergency, go ahead” and lets you place the call.
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