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Should you turn off your phone when changing a SIM card? Smartphone care tips

Most modern smartphones can swap a physical SIM card while powered on, but switching it with the phone turned off is recommended to help prevent network recognition errors. If turning off power is difficult, users can enable airplane mode, wait about 30 seconds, change the SIM and then disable airplane mode. The report also warns about dust, moisture and improper card sizes, and advises extra care with dual-SIM trays and microSD cards.