Denormalize the other way. Add a Contact_type field to the PhoneNumber class.
Then perform 2 queries
  like: PhoneNumber.all().filter('contact_type
=','A':).filter('phone_type =','B').fetch(1000)
   o contact_type='A' and phone_type='B'
   o contact_type='A' and phone_type='C'
Combine both result lists.

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