If you will not ever need more than 3 phone numbers and they will always be for the same usage like Home, Work, and Cell then you could probably create three different fields to store the numbers. If you want more flexibility then each phone number should be stored in a related table that uses one field to link back to your existing table, one field for type of phone number, and one field for the actual phone number.
First normal form (1NF) - All attributes must be atomic. That is, there can exist no repeating groups in an attribute. For example, in a relation that describes a student, the student's classes should not be stored in one field, separated by commas. Rather, the classes should be moved to their own relation, which should include a link back to the student relation (called a foreign key).
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