And like crossing your ankles while sitting or politely holding a clutch in public, the royals understand etiquette.
That's why we asked royally trained etiquette expert Myka Meier, who worked in London and studied under a former member of the Royal Household of Queen Elizabeth, to dish on her biggest tech peeves.
As founder and director of Beaumont Etiquette and instructor for the Plaza Hotel's "Duchess School," Meier is like the Samantha Cohen of New York (remember Markle's duchess school instructor?). She recently offered up some tips for tech etiquette, and dished on her number one no-no: Never ghost on a payment over an online transaction platform like Venmo...and definitely don't take days (God forbid, weeks!) to complete a request after your friend has footed the bill.
"It's really important to make sure that you take the initiative to make sure that you pay back in a timely manner," Meier said.
"The most respectful thing would be to pay right then and there at the restaurant," Meier said. Whoops, we've totally fudged this before. (Sorry, roommate we paid back a full two months later...)
Of course, if you can't bring yourself to do it at the restaurant (or if it's too fancy of an establishment to just casually whip out your device at the table), then her hard and fast rule for online payments is this: Pay the person who foots the bill back within 24 hours of their request.
Also, if you're the person sending the request, Meier said to make sure to submit the request within 24 hours of the outing so it's fresh enough on everyone's minds.
"We've all been there. It's just really awkward to have to send a text message to all your friends [reminding them to pay up]," Meier said. "Being able to make the request over the phone just takes out the awkwardness of that."