Check In can be found on iOS 17 in the Messages app. If you press the plus sign to add an attachment, then choose the “More” option at the bottom of the attachment list, you’ll find the ...

Checking In is pretty simple: First, Find or create a message with the person you want to notify. Then, tap the '+' sign next to the message box, tap Check In, then send!

Hit the + sign to the left of the iMessage chat bar, then tap More and select Check In from the list. If it's your first time using Check In, just follow the on-screen steps to get through the ...

United Airlines is changing its check-in time limits for passengers on domestic flights. Starting June 3, travelers on domestic flights who aren't checking luggage will now need to check in at ...