Answer:
To prepend a number means to add something to the beginning of the number for example, you have an eight hundred number stored in your contacts e.g.
800-111-1111 and every time you call the call doesn't go through because when you entered the number you forgot to put a 1 in front of the 800. So it just means you can edit a number by putting an area code or a one in front of it.
Hope that helped.
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