>I am getting a numeric overflow when I am updating a 2500 or so phone numbers. From what I have read, this error typically comes from dividing by zero. Does anyone have any idea why I would get this when simply updating phone numbers without any mathematical manipulation?
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>I recently changed this field to numeric from character because the phone number mask was not working properly with it as a string.

It's overkill. Why didn't you fix the mask?