For starters computers offer the option of a PIN (default in laptops usually) and you can have a password on a phone. The main reason is convenience. When you turn on your computer you type in the password once and then go on to use it for a few hours. Your phone however you use throughout the day and you keep locking and unlocking it as you take it in and out of your pocket, so a pin is quick and easy enough to input every time you take it out while offering some security.
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