eli5:How is a SIM card identified as switched off and not just outside of a phone instead?

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Like, I lost my sim card. I’m sure it’s somewhere in my home. I have a ton of old phones. When I call the number it says switch off, I wanna know if it’s the same even if the sim is outside of a mobile? How does it all work.

In: Technology

4 Answers

Anonymous 0 Comments

it’s “switched off” because there is no phone worldwide that has your SIM installed, and is switched on.

So, yes it’s the same. The SIM is a very small computer chip that is powered by the phone, and is used to identify the phone towards your mobile network, such that it can recieve calls to “your number”.

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