You Don't Have To Turn Off Your Phone To Switch SIM Cards (But You Probably Should)
Swapping a SIM card is easy, and you don't need to turn your phone off for it to be successful. But if you have the time, it's best to be careful.
Via Engadget

A quick step removes the small chance of anything going wrong and requiring more of your time.
Mikhail Artamonov/Shutterstock
If your phone has a SIM tray, it's not something you likely open often, but there are still reasons to. You may be switching to an MVNO to save money, or maybe you're temporarily swapping out your normal SIM for a cheaper local carrier when travelling. In some cases, your carrier will send you a replacement card if yours is damaged.
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