‘Didn’t know this was a thing’: Apple customer issues warning for people who use calculator on their iPhones 

Did you know that iPhone keeps a history of the math you do on your calculator?

That's great if you're trying to recall an equation you did pertaining to, say, the tips you made in a certain week. It's not great, however, if you're doing math too basic to be doing on a calculator.

That's the premise of a TikTok video on the @jeffersonjohn14 account, going up on Dec. 13 and getting more than 650,000 views since.

The short video clip shows a person's forehead underneath a long caption...