Do I have to switch off my iPhone before removing the SIM card?
Do I have to switch off my phone before doing as described in this article : https://support.apple.com/en-us/HT201337
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I would preferably turn off the device before removing the Sim card just for the piece of mind as you are sticking a metal stick into your phone however, it is not a safety hazard to remove the Sim card while the devices on.