What is a dial out code?

A dial-out code is a number that is automatically added when you dial a number. It can be either your area code or (usually) your country code.
Let's say the number stored in your phone is (123) 456-7899. So if your dial-out code is set to "+1", then the number dialed is +1-123-456-7899. This ensures that, wherever you are on this planet, you will always reach that number in the US.

On home phones you can sometimes set a dial-out code (like "123"), and if you dial 456-7899, then it automatically adds your area code to the number.

What sometimes happens is, let's say you bought your phone in the US, but you live in another country, your phone still automatically adds a "+1" to all your numbers stored in your phone unless specified otherwise. That's why you have to set the dial-out code to your specific region.

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