To print from your iPhone device first, add the Brother printer to the iPhone. After this, to https://printeranswers.com/add-brother-printer-to-iphone/, open the app containing the file you want to print. You can use Mail, Photos, Notes, etc., as your file type for printing. Now, tap on the 'Share' icon located at the bottom of your iPhone screen. Next, swipe from right to left and tap on the 'Print' icon. Now, tap on the 'Printer' button and then choose your Brother printer from the list. Again tap on the 'Print' button, and now, the printer will start printing the selected file from your iPhone through Brother printer.