To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.
The simplest way to think about SCAN is that it applies a custom calculation to each element in a range/array and returns every intermediate result it produces along the way. If that sounds abstract, ...
Unless everyone is using iMessage, there's no way to remove yourself from a group text — you'll need to mute or block it.
To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.