How to use an enumeration and pattern for phone in xsd?

The problem is requesting the following. That the phone should have the attribute type with 3 enumerated values of home, cell, and work. AND the phone should also be restricted to a phone format of (###) ###-####. How do you combine the attribute for enumerated vales AND apply a restricted pattern? XML example:

    <donor level="founder">
      <name>David Brennan</name>
      <address>5133 Oak Street
           Windermere, FL  34786</address>
      <phone type="home">(407) 555-8981</phone>
      <phone type="cell">(407) 555-8189</phone>
      <email>dbrennan@delisp.net</email>
      <donation>50000.00</donation>
      <method>Phone</method>
      <effectiveDate>1982-09-01</effectiveDate>
    </donor>

xsd code I have so far for phone:

    <xs:attribute name="type" type="pType" />

       <xs:simpleType name="phoneType">
          <xs:restriction base="xs:string">
               <xs:pattern value="\(\d{3}\)\s\d{3}-\d{4}" />
          </xs:restriction>
       </xs:simpleType>

   <xs:element name="phone">
     <xs:complexType>  
        <xs:simpleContent>
            <xs:extension base ="xs:string">
                <xs:attribute ref="type" use="required"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>

<xs:simpleType name="pType">
    <xs:restriction base="xs:string">
        <xs:enumeration value="home" />
        <xs:enumeration value="cell" />
        <xs:enumeration value="work" />
    </xs:restriction>
</xs:simpleType>

<xs:element name="donor">
    <xs:complexType>
        <xs:sequence>
            <xs:element ref="name"/>
            <xs:element ref="address"/>
            <xs:element ref="phone" minOccurs="1" maxOccurs="unbounded"/>
            <xs:element ref="email" minOccurs="0" />
            <xs:element ref="donation" />
            <xs:element ref="method" />
            <xs:element ref="effectiveDate" />
        </xs:sequence>
        <xs:attribute ref="level" />
    </xs:complexType>
</xs:element>

</xs:schema>