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== == Manually means using your fingers toenter which means tapping numbers into a keyboardcodes means the numbers that the device needs so that it will start working. Things like passwords or security pin numbers are some of the things which have to be manually entered. Typical things which need to have manually entered codes are: mobile phones (to unlock your SIM card so you can use the phone) credit card readers (to authorise your payment for a purchase) keypad-protected door locks (so you open the door) burglar alarms (so you can "arm" the alarm when you leave your home and "disarm" the alarm when you return home)

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