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Trunkin said:

You don't have to on a smartphone. With my last two phones,  I've removed my SD card without alerting the OS plenty of times, and I haven't suffered any loss of data. Been using the same cards since 2014.

Android has an option to safely remove it. It probably isn't very common to corrupt a card, but if they put an option there it can, at least, be a possibility. I cannot say much about this, because I usually only remove it when I buy a new phone. I have the same 16 GB card for a good 4 years.