It depends on the iPhone model and whether it has a built-in SD card slot or not. Most iPhone models do not have an SD card slot, so you cannot directly insert an SD card into them. However, you can use an SD card reader that connects to your iPhone via the Lightning port or USB-C port, depending on the iPhone model. This will allow you to transfer files from the SD card to your iPhone or vice versa. Alternatively, you can use cloud storage or a computer to transfer files from the SD card to your iPhone.