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Also you can only arrange them in rows, starting at the top and moving left to right. You can't place them anywhere on the screen like you can on some other phone platforms.
Welcome to iMore! On iOS you can rearrange your homescreen by pressing and holding over any app shortcut until all of the shortcuts start to wiggle. Then, you can drag them around with your finger. To group your shortcuts into folders drag one shortcut on top of another and hold in there for a second. A folder will appear. You can rename the folder using the text box at the top.